Name: ______________________________________________________________ Date: ______________________ Period: ______ Chapter 14: Circle Segment Relationships Topic 3: Segments Theorems - Tangents Theorem 3: If a line is tangent to a circle, it is perpendicular to the radius drawn to : is a tangent the point of tangency. is a point of tangency : β₯ Theorem 4: Tangent segments to a circle from the same external point are congruent. IF: is tangent to circle at is tangent to circle at Then: β Practice: 1.) is a tangent. Find x. 2.) is a tangent. Find x. 3.) In the diagram, is a tangent? 4.) is a diameter, the radius = 9, = 24, = 30. Is a tangent?
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it is perpendicular to the radius drawn to πΌπΉ: π΄π΅Μ Μ Μ Μ is a tangent the point of tangency. π· is a point of tangency ππ»πΈπ: ππ·Μ Μ Μ Μ β₯ π΄π΅Μ Μ Μ Μ
Theorem 4: Tangent segments to a circle from the same external point are congruent.
IF: π΄π΅Μ Μ Μ Μ is tangent to circle π at π΄ πΆπ΅Μ Μ Μ Μ is tangent to circle π at πΆ
Then: π΄π΅Μ Μ Μ Μ β πΆπ΅Μ Μ Μ Μ Practice: 1.) πΆπ΅Μ Μ Μ Μ is a tangent. Find x. 2.) πΆπ΅Μ Μ Μ Μ is a tangent. Find x. 3.) In the diagram, is πΆπ΅Μ Μ Μ Μ a tangent? 4.) π΄πΆΜ Μ Μ Μ is a diameter, the radius = 9, πΆπ΅Μ Μ Μ Μ = 24, π΄π΅Μ Μ Μ Μ = 30. Is πΆπ΅Μ Μ Μ Μ a tangent?
5.) π΄π΅Μ Μ Μ Μ , πΆπ΅Μ Μ Μ Μ are tangents. Find x. 6.) π΄π΅Μ Μ Μ Μ , πΆπ΅Μ Μ Μ Μ are tangents. Find x. 7.) Find the perimeter of βπ΄π΅πΆ 8.) Find the perimeter of βπ΄π΅πΆ Common Core Questions: 9.) In circle A, the radius is 9 mm and BC = 12 mm. (a) Find AC. (b) Find the area of βπ΄πΆπ·. (c) Find the perimeter of quadrilateral ABCD.
10.) In circle A, EF = 12 and AE = 13. AE:AC = 1:3. (a) Find the radius of the circle. (b) Find BC (round to the nearest whole number). (c) Find EC.
11.) π΅πΆΜ Μ Μ Μ is tangent to circle A at point B. DC = 9 and BC = 15. (a) Find the radius (r) of the circle. (b) Find AC.
12.) In the diagram, what do you think the length of z could be? How do you know? 13.) In the figure given, the three segments are tangent to the circle at points F, B, and G. Find DE. Explain how you arrived at your answer.
Complete the following questions below. Show all work, including formulas.
1.) In the diagram below, circles X and Y have two tangents drawn to them from external point T. The points of tangency are C, A, S, and E. The ratio of TA to AC is 1:3. If TS = 24, find the length of SE. 2.) Mrs. Smith wants to purchase a cover for their new circular pool. She needs to know the radius of the pool, but she does not want to get wet to take the measurements. She is standing 4 feet from the pool and 12 feet from the point of tangency. Find the radius of the pool. 3.) In the diagram below, π΄π΅Μ Μ Μ Μ , π΅πΆΜ Μ Μ Μ , and π΄πΆΜ Μ Μ Μ are tangents to circle O at points F, E, and D, respectively, AF = 6, CD = 5, and BE = 4. What is the perimeter of ΞABC? (1) 15 (2) 25
(3) 30 (4) 60 4.) As shown in the diagram below, π΅πΜ Μ Μ Μ and tangents π΅π΄Μ Μ Μ Μ and π΅πΆΜ Μ Μ Μ are drawn from an external point B to circle O.
Radii ππ΄Μ Μ Μ Μ and ππΆΜ Μ Μ Μ are drawn. If OA = 7 and DB = 18, determine and state the length of π΄π΅Μ Μ Μ Μ .
5.) The radius of circle A is 4. π·πΆΜ Μ Μ Μ and πΆπΈΜ Μ Μ Μ are tangent to the circle with DC = 12. (a) Find the length of π΄π΅πΆΜ Μ Μ Μ Μ Μ in simplest radical form. (b) Find the area of quadrilateral ADCE to the nearest hundredth.
6.) In the diagram below, π΄πΆΜ Μ Μ Μ and π΅πΆΜ Μ Μ Μ are tangent to circle O at A and B, respectively, from external point C. If πβ π΄πΆπ΅ = 38, what is πβ π΄ππ΅? (1) 71 (2) 104 (3) 142 (4) 161 7.) In the diagram below, π΄πΆΜ Μ Μ Μ and π΄π·Μ Μ Μ Μ are tangent to circle B at points C and D, respectively, and π΅πΆΜ Μ Μ Μ , π΅π·Μ Μ Μ Μ , and π΅π΄Μ Μ Μ Μ are drawn. (a) If AC = 12 and AB = 15, what is the length of π΅π·Μ Μ Μ Μ ? (b) What is the perimeter of quadrilateral ACBD?
Review Questions: 8.) Triangle ABC had vertices A(0,0), B(6,8), and C(8,4). Which equation represents the perpendicular bisector of π΅πΆΜ Μ Μ Μ ?
(1) y = 2x β 6 (2) y = -2x + 4 (3) π¦ =1
2π₯ +
5
2 (4) π¦ = β
1
2π₯ +
19
2
9.) A student used a compass and a straightedge to construct πΆπΈΜ Μ Μ Μ in βπ΄π΅πΆ as shown below. Which statement must always be true for this construction? (1) β πΆπΈπ΄ β β πΆπΈπ΅ (2) β π΄πΆπΈ β β π΅πΆπΈ (3) π΄πΈΜ Μ Μ Μ β π΅πΈΜ Μ Μ Μ
(4) πΈπΆΜ Μ Μ Μ β π΄πΆΜ Μ Μ Μ 10.) Quadrilateral ABCD is graphed on the set of axes below. Classify quadrilateral ABCD. Explain your reasoning.