12.1 Tangent Lines By Brit Caswell.

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Presentation transcript:

12.1 Tangent Lines By Brit Caswell

A little bit of vocab… A tangent to a circle is a line that intersects the circle at exactly one point. The point where the tangent and the circle intersect is called the point of tangency

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

Pg 763, #1 Find the value of x.

Pg 763, Got it? Find the value of x.

Theorem 12-2 If a line is perpendicular to a radius at the end point that is on the circle, then the line is tangent to that circle.

Pg 765, #3 Find the value of x.

Pg 765, #4

Pg 766, #5 Find the perimeter of the triangle.