Warm Up 3-7 Write the standard form equation of the circle.

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Presentation transcript:

Warm Up 3-7 Write the standard form equation of the circle

Announcements Test Friday Online Homework due Wednesday night Warm ups due Thursday

Tangent Lines A tangent to a circle is a line in the plane of the circle that intersects the circle in exactly one point. The point where a circle and a tangent intersect is the point of tangency.

Theorem 12-1

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.

Theorem 12-3 If two tangent segments to a circle share a common endpoint outside the circle, then the two segments are congruent.

Example 1 What is the radius of the circle?

Example 2 IS ML tangent to circle N?

Example 3 Circle A is inscribed in the quadrilateral, what is the perimeter?

Classwork –Pg. 490 #1-3, 7-11