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Chapter Eleven: |
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Geometry Notes Chapter 11 Section 11.1
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Take notes on the following topics.
Section 11.1 Tangent Lines Vocabulary Tangent to a circle (p. 582) A tangent to a circle is a line, segment, or ray in the plane of the circle that intersects the circle in exactly one point. That point is the point of tangency. Inscribed in (p. 585) A circle is inscribed in a polygon if the sides of the polygon are tangent to the circle. A polygon is inscribed in a circle if the vertices of the polygon are on the circle. Circumscribed about (p. 585) A circle is circumscribed about a polygon if the vertices of the polygon are on the circle. A polygon is circumscribed about a circle if all the sides of the polygon are tangent to the circle. Theorem 11-1
If a line is tangent to a circle, then
the line is perpendicular to the radius drawn to the point of
tangency.
Theorem 11-2
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 11-3
The two segments tangent to a circle from
a point outside the circle are congruent.
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