MarkingScheme - M. Selkirk Confey College · 2019. 11. 23. · 1800 Therefore DOEC is a cyclic quadrilateral (by the converse of Corollary 5). Therefore ZDOC and LDEC are angles standing

Page 1 <img data-url='document/markingscheme-m-selkirk-confey-college-2019-11-23-1800-therefore-doec-is.html?page=1' data-page='1' class='cut-thumb lazyload' alt='Page 1: MarkingScheme - M. Selkirk Confey College · 2019. 11. 23. · 1800 Therefore DOEC is a cyclic quadrilateral (by the converse of Corollary 5). Therefore ZDOC and LDEC are angles standing' loading='lazy' src='data:image/gif;base64,iVBORw0KGgoAAAANSUhEUgAAAAEAAAABCAYAAAAfFcSJAAAADUlEQVR42mNk+P+/HgAFhAJ/wlseKgAAAABJRU5ErkJggg==' data-src='https://reader035.cupdf.com/reader035/viewer/2022071503/6123b04db5f8aa6bfe3c5bd9/html5/thumbnails/1.jpg' width='140' height='200' /> MarkingSchemeGeometryH

Question 1 (2017)

Page 2 <img data-url='document/markingscheme-m-selkirk-confey-college-2019-11-23-1800-therefore-doec-is.html?page=2' data-page='2' class='cut-thumb lazyload' alt='Page 2: MarkingScheme - M. Selkirk Confey College · 2019. 11. 23. · 1800 Therefore DOEC is a cyclic quadrilateral (by the converse of Corollary 5). Therefore ZDOC and LDEC are angles standing' loading='lazy' src='data:image/gif;base64,iVBORw0KGgoAAAANSUhEUgAAAAEAAAABCAYAAAAfFcSJAAAADUlEQVR42mNk+P+/HgAFhAJ/wlseKgAAAABJRU5ErkJggg==' data-src='https://reader035.cupdf.com/reader035/viewer/2022071503/6123b04db5f8aa6bfe3c5bd9/html5/thumbnails/2.jpg' width='140' height='200' /> Page 3 <img data-url='document/markingscheme-m-selkirk-confey-college-2019-11-23-1800-therefore-doec-is.html?page=3' data-page='3' class='cut-thumb lazyload' alt='Page 3: MarkingScheme - M. Selkirk Confey College · 2019. 11. 23. · 1800 Therefore DOEC is a cyclic quadrilateral (by the converse of Corollary 5). Therefore ZDOC and LDEC are angles standing' loading='lazy' src='data:image/gif;base64,iVBORw0KGgoAAAANSUhEUgAAAAEAAAABCAYAAAAfFcSJAAAADUlEQVR42mNk+P+/HgAFhAJ/wlseKgAAAABJRU5ErkJggg==' data-src='https://reader035.cupdf.com/reader035/viewer/2022071503/6123b04db5f8aa6bfe3c5bd9/html5/thumbnails/3.jpg' width='140' height='200' /> Question 2 (2016)

Page 4 <img data-url='document/markingscheme-m-selkirk-confey-college-2019-11-23-1800-therefore-doec-is.html?page=4' data-page='4' class='cut-thumb lazyload' alt='Page 4: MarkingScheme - M. Selkirk Confey College · 2019. 11. 23. · 1800 Therefore DOEC is a cyclic quadrilateral (by the converse of Corollary 5). Therefore ZDOC and LDEC are angles standing' loading='lazy' src='data:image/gif;base64,iVBORw0KGgoAAAANSUhEUgAAAAEAAAABCAYAAAAfFcSJAAAADUlEQVR42mNk+P+/HgAFhAJ/wlseKgAAAABJRU5ErkJggg==' data-src='https://reader035.cupdf.com/reader035/viewer/2022071503/6123b04db5f8aa6bfe3c5bd9/html5/thumbnails/4.jpg' width='140' height='200' /> Question 3 (2015)

Page 5 <img data-url='document/markingscheme-m-selkirk-confey-college-2019-11-23-1800-therefore-doec-is.html?page=5' data-page='5' class='cut-thumb lazyload' alt='Page 5: MarkingScheme - M. Selkirk Confey College · 2019. 11. 23. · 1800 Therefore DOEC is a cyclic quadrilateral (by the converse of Corollary 5). Therefore ZDOC and LDEC are angles standing' loading='lazy' src='data:image/gif;base64,iVBORw0KGgoAAAANSUhEUgAAAAEAAAABCAYAAAAfFcSJAAAADUlEQVR42mNk+P+/HgAFhAJ/wlseKgAAAABJRU5ErkJggg==' data-src='https://reader035.cupdf.com/reader035/viewer/2022071503/6123b04db5f8aa6bfe3c5bd9/html5/thumbnails/5.jpg' width='140' height='200' /> Page 6 <img data-url='document/markingscheme-m-selkirk-confey-college-2019-11-23-1800-therefore-doec-is.html?page=6' data-page='6' class='cut-thumb lazyload' alt='Page 6: MarkingScheme - M. Selkirk Confey College · 2019. 11. 23. · 1800 Therefore DOEC is a cyclic quadrilateral (by the converse of Corollary 5). Therefore ZDOC and LDEC are angles standing' loading='lazy' src='data:image/gif;base64,iVBORw0KGgoAAAANSUhEUgAAAAEAAAABCAYAAAAfFcSJAAAADUlEQVR42mNk+P+/HgAFhAJ/wlseKgAAAABJRU5ErkJggg==' data-src='https://reader035.cupdf.com/reader035/viewer/2022071503/6123b04db5f8aa6bfe3c5bd9/html5/thumbnails/6.jpg' width='140' height='200' /> Question 4 (2015)

Page 7 <img data-url='document/markingscheme-m-selkirk-confey-college-2019-11-23-1800-therefore-doec-is.html?page=7' data-page='7' class='cut-thumb lazyload' alt='Page 7: MarkingScheme - M. Selkirk Confey College · 2019. 11. 23. · 1800 Therefore DOEC is a cyclic quadrilateral (by the converse of Corollary 5). Therefore ZDOC and LDEC are angles standing' loading='lazy' src='data:image/gif;base64,iVBORw0KGgoAAAANSUhEUgAAAAEAAAABCAYAAAAfFcSJAAAADUlEQVR42mNk+P+/HgAFhAJ/wlseKgAAAABJRU5ErkJggg==' data-src='https://reader035.cupdf.com/reader035/viewer/2022071503/6123b04db5f8aa6bfe3c5bd9/html5/thumbnails/7.jpg' width='140' height='200' /> Page 8 <img data-url='document/markingscheme-m-selkirk-confey-college-2019-11-23-1800-therefore-doec-is.html?page=8' data-page='8' class='cut-thumb lazyload' alt='Page 8: MarkingScheme - M. Selkirk Confey College · 2019. 11. 23. · 1800 Therefore DOEC is a cyclic quadrilateral (by the converse of Corollary 5). Therefore ZDOC and LDEC are angles standing' loading='lazy' src='data:image/gif;base64,iVBORw0KGgoAAAANSUhEUgAAAAEAAAABCAYAAAAfFcSJAAAADUlEQVR42mNk+P+/HgAFhAJ/wlseKgAAAABJRU5ErkJggg==' data-src='https://reader035.cupdf.com/reader035/viewer/2022071503/6123b04db5f8aa6bfe3c5bd9/html5/thumbnails/8.jpg' width='140' height='200' /> Page 9 <img data-url='document/markingscheme-m-selkirk-confey-college-2019-11-23-1800-therefore-doec-is.html?page=9' data-page='9' class='cut-thumb lazyload' alt='Page 9: MarkingScheme - M. Selkirk Confey College · 2019. 11. 23. · 1800 Therefore DOEC is a cyclic quadrilateral (by the converse of Corollary 5). Therefore ZDOC and LDEC are angles standing' loading='lazy' src='data:image/gif;base64,iVBORw0KGgoAAAANSUhEUgAAAAEAAAABCAYAAAAfFcSJAAAADUlEQVR42mNk+P+/HgAFhAJ/wlseKgAAAABJRU5ErkJggg==' data-src='https://reader035.cupdf.com/reader035/viewer/2022071503/6123b04db5f8aa6bfe3c5bd9/html5/thumbnails/9.jpg' width='140' height='200' /> Page 10 <img data-url='document/markingscheme-m-selkirk-confey-college-2019-11-23-1800-therefore-doec-is.html?page=10' data-page='10' class='cut-thumb lazyload' alt='Page 10: MarkingScheme - M. Selkirk Confey College · 2019. 11. 23. · 1800 Therefore DOEC is a cyclic quadrilateral (by the converse of Corollary 5). Therefore ZDOC and LDEC are angles standing' loading='lazy' src='data:image/gif;base64,iVBORw0KGgoAAAANSUhEUgAAAAEAAAABCAYAAAAfFcSJAAAADUlEQVR42mNk+P+/HgAFhAJ/wlseKgAAAABJRU5ErkJggg==' data-src='https://reader035.cupdf.com/reader035/viewer/2022071503/6123b04db5f8aa6bfe3c5bd9/html5/thumbnails/10.jpg' width='140' height='200' /> Question 5 (2014)

Page 11 <img data-url='document/markingscheme-m-selkirk-confey-college-2019-11-23-1800-therefore-doec-is.html?page=11' data-page='11' class='cut-thumb lazyload' alt='Page 11: MarkingScheme - M. Selkirk Confey College · 2019. 11. 23. · 1800 Therefore DOEC is a cyclic quadrilateral (by the converse of Corollary 5). Therefore ZDOC and LDEC are angles standing' loading='lazy' src='data:image/gif;base64,iVBORw0KGgoAAAANSUhEUgAAAAEAAAABCAYAAAAfFcSJAAAADUlEQVR42mNk+P+/HgAFhAJ/wlseKgAAAABJRU5ErkJggg==' data-src='https://reader035.cupdf.com/reader035/viewer/2022071503/6123b04db5f8aa6bfe3c5bd9/html5/thumbnails/11.jpg' width='140' height='200' /> Page 12 <img data-url='document/markingscheme-m-selkirk-confey-college-2019-11-23-1800-therefore-doec-is.html?page=12' data-page='12' class='cut-thumb lazyload' alt='Page 12: MarkingScheme - M. Selkirk Confey College · 2019. 11. 23. · 1800 Therefore DOEC is a cyclic quadrilateral (by the converse of Corollary 5). Therefore ZDOC and LDEC are angles standing' loading='lazy' src='data:image/gif;base64,iVBORw0KGgoAAAANSUhEUgAAAAEAAAABCAYAAAAfFcSJAAAADUlEQVR42mNk+P+/HgAFhAJ/wlseKgAAAABJRU5ErkJggg==' data-src='https://reader035.cupdf.com/reader035/viewer/2022071503/6123b04db5f8aa6bfe3c5bd9/html5/thumbnails/12.jpg' width='140' height='200' /> Question 6 (2014)

Page 13 <img data-url='document/markingscheme-m-selkirk-confey-college-2019-11-23-1800-therefore-doec-is.html?page=13' data-page='13' class='cut-thumb lazyload' alt='Page 13: MarkingScheme - M. Selkirk Confey College · 2019. 11. 23. · 1800 Therefore DOEC is a cyclic quadrilateral (by the converse of Corollary 5). Therefore ZDOC and LDEC are angles standing' loading='lazy' src='data:image/gif;base64,iVBORw0KGgoAAAANSUhEUgAAAAEAAAABCAYAAAAfFcSJAAAADUlEQVR42mNk+P+/HgAFhAJ/wlseKgAAAABJRU5ErkJggg==' data-src='https://reader035.cupdf.com/reader035/viewer/2022071503/6123b04db5f8aa6bfe3c5bd9/html5/thumbnails/13.jpg' width='140' height='200' /> Question 7 (2014)

Question 8 (2013)

Page 14 <img data-url='document/markingscheme-m-selkirk-confey-college-2019-11-23-1800-therefore-doec-is.html?page=14' data-page='14' class='cut-thumb lazyload' alt='Page 14: MarkingScheme - M. Selkirk Confey College · 2019. 11. 23. · 1800 Therefore DOEC is a cyclic quadrilateral (by the converse of Corollary 5). Therefore ZDOC and LDEC are angles standing' loading='lazy' src='data:image/gif;base64,iVBORw0KGgoAAAANSUhEUgAAAAEAAAABCAYAAAAfFcSJAAAADUlEQVR42mNk+P+/HgAFhAJ/wlseKgAAAABJRU5ErkJggg==' data-src='https://reader035.cupdf.com/reader035/viewer/2022071503/6123b04db5f8aa6bfe3c5bd9/html5/thumbnails/14.jpg' width='140' height='200' /> Page 15 <img data-url='document/markingscheme-m-selkirk-confey-college-2019-11-23-1800-therefore-doec-is.html?page=15' data-page='15' class='cut-thumb lazyload' alt='Page 15: MarkingScheme - M. Selkirk Confey College · 2019. 11. 23. · 1800 Therefore DOEC is a cyclic quadrilateral (by the converse of Corollary 5). Therefore ZDOC and LDEC are angles standing' loading='lazy' src='data:image/gif;base64,iVBORw0KGgoAAAANSUhEUgAAAAEAAAABCAYAAAAfFcSJAAAADUlEQVR42mNk+P+/HgAFhAJ/wlseKgAAAABJRU5ErkJggg==' data-src='https://reader035.cupdf.com/reader035/viewer/2022071503/6123b04db5f8aa6bfe3c5bd9/html5/thumbnails/15.jpg' width='140' height='200' /> Question 9 (2012)

Page 16 <img data-url='document/markingscheme-m-selkirk-confey-college-2019-11-23-1800-therefore-doec-is.html?page=16' data-page='16' class='cut-thumb lazyload' alt='Page 16: MarkingScheme - M. Selkirk Confey College · 2019. 11. 23. · 1800 Therefore DOEC is a cyclic quadrilateral (by the converse of Corollary 5). Therefore ZDOC and LDEC are angles standing' loading='lazy' src='data:image/gif;base64,iVBORw0KGgoAAAANSUhEUgAAAAEAAAABCAYAAAAfFcSJAAAADUlEQVR42mNk+P+/HgAFhAJ/wlseKgAAAABJRU5ErkJggg==' data-src='https://reader035.cupdf.com/reader035/viewer/2022071503/6123b04db5f8aa6bfe3c5bd9/html5/thumbnails/16.jpg' width='140' height='200' /> Page 17 <img data-url='document/markingscheme-m-selkirk-confey-college-2019-11-23-1800-therefore-doec-is.html?page=17' data-page='17' class='cut-thumb lazyload' alt='Page 17: MarkingScheme - M. Selkirk Confey College · 2019. 11. 23. · 1800 Therefore DOEC is a cyclic quadrilateral (by the converse of Corollary 5). Therefore ZDOC and LDEC are angles standing' loading='lazy' src='data:image/gif;base64,iVBORw0KGgoAAAANSUhEUgAAAAEAAAABCAYAAAAfFcSJAAAADUlEQVR42mNk+P+/HgAFhAJ/wlseKgAAAABJRU5ErkJggg==' data-src='https://reader035.cupdf.com/reader035/viewer/2022071503/6123b04db5f8aa6bfe3c5bd9/html5/thumbnails/17.jpg' width='140' height='200' /> Page 18 <img data-url='document/markingscheme-m-selkirk-confey-college-2019-11-23-1800-therefore-doec-is.html?page=18' data-page='18' class='cut-thumb lazyload' alt='Page 18: MarkingScheme - M. Selkirk Confey College · 2019. 11. 23. · 1800 Therefore DOEC is a cyclic quadrilateral (by the converse of Corollary 5). Therefore ZDOC and LDEC are angles standing' loading='lazy' src='data:image/gif;base64,iVBORw0KGgoAAAANSUhEUgAAAAEAAAABCAYAAAAfFcSJAAAADUlEQVR42mNk+P+/HgAFhAJ/wlseKgAAAABJRU5ErkJggg==' data-src='https://reader035.cupdf.com/reader035/viewer/2022071503/6123b04db5f8aa6bfe3c5bd9/html5/thumbnails/18.jpg' width='140' height='200' /> Question 10 (2012)

Page 19 <img data-url='document/markingscheme-m-selkirk-confey-college-2019-11-23-1800-therefore-doec-is.html?page=19' data-page='19' class='cut-thumb lazyload' alt='Page 19: MarkingScheme - M. Selkirk Confey College · 2019. 11. 23. · 1800 Therefore DOEC is a cyclic quadrilateral (by the converse of Corollary 5). Therefore ZDOC and LDEC are angles standing' loading='lazy' src='data:image/gif;base64,iVBORw0KGgoAAAANSUhEUgAAAAEAAAABCAYAAAAfFcSJAAAADUlEQVR42mNk+P+/HgAFhAJ/wlseKgAAAABJRU5ErkJggg==' data-src='https://reader035.cupdf.com/reader035/viewer/2022071503/6123b04db5f8aa6bfe3c5bd9/html5/thumbnails/19.jpg' width='140' height='200' /> Question 11 (2012)

Page 20 <img data-url='document/markingscheme-m-selkirk-confey-college-2019-11-23-1800-therefore-doec-is.html?page=20' data-page='20' class='cut-thumb lazyload' alt='Page 20: MarkingScheme - M. Selkirk Confey College · 2019. 11. 23. · 1800 Therefore DOEC is a cyclic quadrilateral (by the converse of Corollary 5). Therefore ZDOC and LDEC are angles standing' loading='lazy' src='data:image/gif;base64,iVBORw0KGgoAAAANSUhEUgAAAAEAAAABCAYAAAAfFcSJAAAADUlEQVR42mNk+P+/HgAFhAJ/wlseKgAAAABJRU5ErkJggg==' data-src='https://reader035.cupdf.com/reader035/viewer/2022071503/6123b04db5f8aa6bfe3c5bd9/html5/thumbnails/20.jpg' width='140' height='200' /> Page 21 <img data-url='document/markingscheme-m-selkirk-confey-college-2019-11-23-1800-therefore-doec-is.html?page=21' data-page='21' class='cut-thumb lazyload' alt='Page 21: MarkingScheme - M. Selkirk Confey College · 2019. 11. 23. · 1800 Therefore DOEC is a cyclic quadrilateral (by the converse of Corollary 5). Therefore ZDOC and LDEC are angles standing' loading='lazy' src='data:image/gif;base64,iVBORw0KGgoAAAANSUhEUgAAAAEAAAABCAYAAAAfFcSJAAAADUlEQVR42mNk+P+/HgAFhAJ/wlseKgAAAABJRU5ErkJggg==' data-src='https://reader035.cupdf.com/reader035/viewer/2022071503/6123b04db5f8aa6bfe3c5bd9/html5/thumbnails/21.jpg' width='140' height='200' /> Page 22 <img data-url='document/markingscheme-m-selkirk-confey-college-2019-11-23-1800-therefore-doec-is.html?page=22' data-page='22' class='cut-thumb lazyload' alt='Page 22: MarkingScheme - M. Selkirk Confey College · 2019. 11. 23. · 1800 Therefore DOEC is a cyclic quadrilateral (by the converse of Corollary 5). Therefore ZDOC and LDEC are angles standing' loading='lazy' src='data:image/gif;base64,iVBORw0KGgoAAAANSUhEUgAAAAEAAAABCAYAAAAfFcSJAAAADUlEQVR42mNk+P+/HgAFhAJ/wlseKgAAAABJRU5ErkJggg==' data-src='https://reader035.cupdf.com/reader035/viewer/2022071503/6123b04db5f8aa6bfe3c5bd9/html5/thumbnails/22.jpg' width='140' height='200' /> Page 23 <img data-url='document/markingscheme-m-selkirk-confey-college-2019-11-23-1800-therefore-doec-is.html?page=23' data-page='23' class='cut-thumb lazyload' alt='Page 23: MarkingScheme - M. Selkirk Confey College · 2019. 11. 23. · 1800 Therefore DOEC is a cyclic quadrilateral (by the converse of Corollary 5). Therefore ZDOC and LDEC are angles standing' loading='lazy' src='data:image/gif;base64,iVBORw0KGgoAAAANSUhEUgAAAAEAAAABCAYAAAAfFcSJAAAADUlEQVR42mNk+P+/HgAFhAJ/wlseKgAAAABJRU5ErkJggg==' data-src='https://reader035.cupdf.com/reader035/viewer/2022071503/6123b04db5f8aa6bfe3c5bd9/html5/thumbnails/23.jpg' width='140' height='200' /> Question 12 (2012)

Page 24 <img data-url='document/markingscheme-m-selkirk-confey-college-2019-11-23-1800-therefore-doec-is.html?page=24' data-page='24' class='cut-thumb lazyload' alt='Page 24: MarkingScheme - M. Selkirk Confey College · 2019. 11. 23. · 1800 Therefore DOEC is a cyclic quadrilateral (by the converse of Corollary 5). Therefore ZDOC and LDEC are angles standing' loading='lazy' src='data:image/gif;base64,iVBORw0KGgoAAAANSUhEUgAAAAEAAAABCAYAAAAfFcSJAAAADUlEQVR42mNk+P+/HgAFhAJ/wlseKgAAAABJRU5ErkJggg==' data-src='https://reader035.cupdf.com/reader035/viewer/2022071503/6123b04db5f8aa6bfe3c5bd9/html5/thumbnails/24.jpg' width='140' height='200' /> Question 13 (2012)

Page 25 <img data-url='document/markingscheme-m-selkirk-confey-college-2019-11-23-1800-therefore-doec-is.html?page=25' data-page='25' class='cut-thumb lazyload' alt='Page 25: MarkingScheme - M. Selkirk Confey College · 2019. 11. 23. · 1800 Therefore DOEC is a cyclic quadrilateral (by the converse of Corollary 5). Therefore ZDOC and LDEC are angles standing' loading='lazy' src='data:image/gif;base64,iVBORw0KGgoAAAANSUhEUgAAAAEAAAABCAYAAAAfFcSJAAAADUlEQVR42mNk+P+/HgAFhAJ/wlseKgAAAABJRU5ErkJggg==' data-src='https://reader035.cupdf.com/reader035/viewer/2022071503/6123b04db5f8aa6bfe3c5bd9/html5/thumbnails/25.jpg' width='140' height='200' /> Page 26 <img data-url='document/markingscheme-m-selkirk-confey-college-2019-11-23-1800-therefore-doec-is.html?page=26' data-page='26' class='cut-thumb lazyload' alt='Page 26: MarkingScheme - M. Selkirk Confey College · 2019. 11. 23. · 1800 Therefore DOEC is a cyclic quadrilateral (by the converse of Corollary 5). Therefore ZDOC and LDEC are angles standing' loading='lazy' src='data:image/gif;base64,iVBORw0KGgoAAAANSUhEUgAAAAEAAAABCAYAAAAfFcSJAAAADUlEQVR42mNk+P+/HgAFhAJ/wlseKgAAAABJRU5ErkJggg==' data-src='https://reader035.cupdf.com/reader035/viewer/2022071503/6123b04db5f8aa6bfe3c5bd9/html5/thumbnails/26.jpg' width='140' height='200' /> Question 14 (2011)

Question 15 (2010)

Page 27 <img data-url='document/markingscheme-m-selkirk-confey-college-2019-11-23-1800-therefore-doec-is.html?page=27' data-page='27' class='cut-thumb lazyload' alt='Page 27: MarkingScheme - M. Selkirk Confey College · 2019. 11. 23. · 1800 Therefore DOEC is a cyclic quadrilateral (by the converse of Corollary 5). Therefore ZDOC and LDEC are angles standing' loading='lazy' src='data:image/gif;base64,iVBORw0KGgoAAAANSUhEUgAAAAEAAAABCAYAAAAfFcSJAAAADUlEQVR42mNk+P+/HgAFhAJ/wlseKgAAAABJRU5ErkJggg==' data-src='https://reader035.cupdf.com/reader035/viewer/2022071503/6123b04db5f8aa6bfe3c5bd9/html5/thumbnails/27.jpg' width='140' height='200' /> Question 16 (2010)

Page 28 <img data-url='document/markingscheme-m-selkirk-confey-college-2019-11-23-1800-therefore-doec-is.html?page=28' data-page='28' class='cut-thumb lazyload' alt='Page 28: MarkingScheme - M. Selkirk Confey College · 2019. 11. 23. · 1800 Therefore DOEC is a cyclic quadrilateral (by the converse of Corollary 5). Therefore ZDOC and LDEC are angles standing' loading='lazy' src='data:image/gif;base64,iVBORw0KGgoAAAANSUhEUgAAAAEAAAABCAYAAAAfFcSJAAAADUlEQVR42mNk+P+/HgAFhAJ/wlseKgAAAABJRU5ErkJggg==' data-src='https://reader035.cupdf.com/reader035/viewer/2022071503/6123b04db5f8aa6bfe3c5bd9/html5/thumbnails/28.jpg' width='140' height='200' /> Page 29 <img data-url='document/markingscheme-m-selkirk-confey-college-2019-11-23-1800-therefore-doec-is.html?page=29' data-page='29' class='cut-thumb lazyload' alt='Page 29: MarkingScheme - M. Selkirk Confey College · 2019. 11. 23. · 1800 Therefore DOEC is a cyclic quadrilateral (by the converse of Corollary 5). Therefore ZDOC and LDEC are angles standing' loading='lazy' src='data:image/gif;base64,iVBORw0KGgoAAAANSUhEUgAAAAEAAAABCAYAAAAfFcSJAAAADUlEQVR42mNk+P+/HgAFhAJ/wlseKgAAAABJRU5ErkJggg==' data-src='https://reader035.cupdf.com/reader035/viewer/2022071503/6123b04db5f8aa6bfe3c5bd9/html5/thumbnails/29.jpg' width='140' height='200' />

MarkingScheme - M. Selkirk Confey College · 2019. 11. 23. · 1800 Therefore DOEC is a cyclic quadrilateral (by the converse of Corollary 5). Therefore ZDOC and LDEC are angles standing

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