Lesson 8-3 Tangents Lesson 8-3: Tangents.

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Presentation transcript:

Lesson 8-3 Tangents Lesson 8-3: Tangents

THEOREM #1: If a line is tangent to a circle, then it is perpendicular to the radius drawn to the point of tangency. Example: Find the value of A B C D 4 3 A B C Lesson 8-3: Tangents

THEOREM #2: If two segments from the same exterior point are tangent to a circle, then they are congruent. B C A Example: Find the value of If AB = 1.8 cm, then AF = 1.8 cm AE = AF + FE AE = 1.8 + 7.0 = 8.8 cm If FE = 7.0 cm, then DE = 7.0 cm CE = CD + DE CE = 2.4 + 7.0 = 9.4 cm 2.4 cm 1.8 7.0 E A C F B D Lesson 8-3: Tangents