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Sections 4.3, 4.7, 4.8 – Using Triangles

Sections 4.3, 4.7, 4.8 – Using Triangles. HW #20 pg. 237 #13-15, 23 pg. 267 #1-13, 15-17, 19, 23-25 . Stability . Which of the following figures is stable? Why? . Special Triangles . Base Angles Theorem

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Sections 4.3, 4.7, 4.8 – Using Triangles

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  1. Sections 4.3, 4.7, 4.8 – Using Triangles HW #20 pg. 237 #13-15, 23 pg. 267 #1-13, 15-17, 19, 23-25

  2. Stability • Which of the following figures is stable? Why?

  3. Special Triangles • Base Angles Theorem • If two sides of a triangle are congruent, then the angles of the opposite sides are congruent • Converse of Base Angles • If two angles of a triangle are congruent, then the sides opposite them are congruent.

  4. Example • Which two angles in the following triangle are congruent?

  5. Corollaries • If a triangle is equilateral, then it is equiangular. • If a triangle is equiangular, then it is equilateral.

  6. Equilaterals • Find the measures of the three interior angles.

  7. Example • Find x and y.

  8. Example • Find x and y.

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