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Section 10-1

Section 10-1. Tangents to Circles. Theorem 10-1. If a line is tangent to a circle, then the line is perpendicular to the radius drawn to the point of tangency. l. Point of Tangency. Q. P. If l is tangent to Circle P at Q, then. Theorem 10-2.

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Section 10-1

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  1. Section 10-1 Tangents to Circles

  2. Theorem 10-1 • If a line is tangent to a circle, then the line is perpendicular to the radius drawn to the point of tangency.

  3. l Point of Tangency Q P If l is tangent to Circle P at Q, then

  4. Theorem 10-2 • In the plane, if a line is perpendicular to a radius of a circle at its endpoint on the circle, then the line is tangent to the circle.

  5. Tangent line l If , Q P then l is tangent to Circle P at Q

  6. Theorem 10-3 • If two segments from the same exterior point are tangent to a circle, then they are congruent.

  7. A Q B P and are tangent to Circle Q

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