Secant and Tangent Lines in Circles

Point B is a point of tangency. Find the radius r of circle C.

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• 9

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CCSS.HSG.C.A.2

Points B and D are both points of tangency. Find x.

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CCSS.HSG.C.A.2

Name a secant of the circle.

Name a tangent of the circle.

Is AB tangent to circle C?

• Yes, because triangle ABC is a right triangle.

• No, because triangle ABC is not a right triangle.

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CCSS.HSG.C.A.2

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• 9

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CCSS.HSG.C.A.2

What can you conlude?

• AB and AC are not congruent.

• AB= half of AC

• AC = half of AB

• AB=AC

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CCSS.HSG.C.A.2

If a line is tangent to a circle, then it is _____ to the radius drawn at the point of tangency.

• Parallel

• Skew

• Perpendicular

• Bisecting

The point where the tangent and a circle intersect is called the____.

• diameter

• chord

• tangent

• point of tangency

Point B is a point of tangency, Find the radius r of circle C.

• 3.75

• 4

• 4

• 4.5

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CCSS.HSG.C.A.2