Chapter 12.1 Tangent Lines
Vocabulary
• Tangent to a circle = a line in the plane of the circle that intersects the circle in exactly one point
Vocabulary
Point of Tangency = point where a circle and a tangent intersect
Vocabulary
• Inscribed in = circle is inscribed in a triangle
• Circumscribed about = triangle is circumscribed about the circle
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
Example #1
117
X
Find X
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
Example #2
• Find X X
Theorem 12.3
• The two segment tangent to a circle from a point outside the circle are congruent
Example #3
Find the perimeter of the triangle
Example #4
Find Y
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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