1.4 Perimeter, Area, and Classifying Polygons 2016 1 September 08, 2016 Mental Floss : (Part 1) Friday Sept 9 th Mental Floss : (Part 2) Friday Sept 9 th 1.4 Perimeter and Area in the Coordinate Plane Lesson Objectives • Classify polygons • Find the perimeters and areas of polygons in the coordinate plane What are Polygons? Poly gons Many Angles Polygons have/are: 1. 2. 3. 4. Polygons NOT Polygons A B C D E Side Vertex C • Segments Polygon ABCDE • Must name polygon by vertices (letters) in order around the shape • May start at any point • May go CW or CCW around polygon • Points • Plural is "vertices" Interior (Inside) Exterior (Outside) Naming Polygons Convex or Concave? Polygons can also be classified as either convex or concave . Convex • No interior angles larger than 180 0 • No line that contains a side of the polygon passes through the interior Concave • 1 or more interior angle is larger than 180 0 • 1 or more line containing a side passes through the interior • Has a "cave" in it, or it bends in on itself