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Angle Bisectors

Angle Bisectors. Section 5.3. Angle Bisector Theorem. A point is on the bisector of an angle if and only if it is equidistant from the two sides of the angle. Find the measure of ∠ GFJ .

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Angle Bisectors

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  1. Angle Bisectors Section 5.3

  2. Angle Bisector Theorem • A point is on the bisector of an angle if and only if it is equidistant from the two sides of the angle.

  3. Find the measure of ∠ GFJ. Because JG FGand JH FHand JG =JH = 7, FJ bisects GFH by the Converse of the Angle Bisector Theorem. So,m GFJ =m HFJ = 42 . o EXAMPLE 1 Use the Angle Bisector Theorems SOLUTION

  4. Concurrency • The point of intersection of the lines, rays, or segments is called the point of concurrency.

  5. Points of concurrency • The point of concurrency of the three angle bisectors of a triangle is called the incenter. • The incenterwill always be inside the triangle.

  6. What is special about the Incenter? • The angle bisectors of a triangle intersect at a point that is equidistant from the • sides of the triangle. PD = PE = PF

  7. In the diagram, Nis the incenter of ABC. Find ND. EXAMPLE 4 Use the concurrency of angle bisectors

  8. Assignment • p. 313: 3-5, 12-14, 18-20

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