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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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