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Chapter 12.1 Tangent Lines

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Vocabulary Tangent to a circle = a line in the plane of the circle that intersects the circle in exactly one point

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Vocabulary Point of Tangency = point where a circle and a tangent intersect

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Vocabulary Inscribed in = circle is inscribed in a triangle Circumscribed about = triangle is circumscribed about the circle

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

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Example #1 117 X Find X

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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

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Example #2 Find X X

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Theorem 12.3 The two segment tangent to a circle from a point outside the circle are congruent

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Example #3 Find the perimeter of the triangle

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Example #4 Find Y

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Classwork/Homework Due Tuesday Pgs 665-667 #2,3,8-10, 13-15, 17-19, 25 Due Wednesday Pgs 665-667 #1,4-7, 11,12, 20, 23

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Section 10.1 cont. Tangents. A tangent to a circle is This point of intersection is called the a line, in the plane of the circle, that intersects the.

Section 10.1 cont. Tangents. A tangent to a circle is This point of intersection is called the a line, in the plane of the circle, that intersects the.

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