Chapter 12.1 Tangent Lines. Vocabulary Tangent to a circle = a line in the plane of the circle that intersects the circle in exactly one point.

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Presentation transcript:

Chapter 12.1 Tangent Lines

Vocabulary Tangent to a circle = a line in the plane of the circle that intersects the circle in exactly one point

Vocabulary Point of Tangency = point where a circle and a tangent intersect

Vocabulary Inscribed in = circle is inscribed in a triangle Circumscribed about = triangle is circumscribed about the circle

Theorem 12-1 If a line is tangent to a circle, then the line is perpendicular to the radius drawn to the point of tangency

Example #1 117 X Find X

Theorem 12.2 If a line in the plane of a circle is perpendicular to a radius at its endpoint on the circle, then the line is tangent to the circle

Example #2 Find X X

Theorem 12.3 The two segment tangent to a circle from a point outside the circle are congruent

Example #3 Find the perimeter of the triangle

Example #4 Find Y

Classwork/Homework Due Tuesday Pgs #2,3,8-10, 13-15, 17-19, 25 Due Wednesday Pgs #1,4-7, 11,12, 20, 23