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Use Isosceles and equilateral triangles

Use Isosceles and equilateral triangles. Section 4.7. Parts of an isosceles triangle. The two congruent sides of an isosceles triangle are called the legs. The angle formed by the legs is the vertex angle. The third side is the base of the isosceles triangle.

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Use Isosceles and equilateral triangles

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  1. Use Isosceles and equilateral triangles Section 4.7

  2. Parts of an isosceles triangle • The two congruent sides of an isosceles triangle are called the legs. • The angle formed by the legs is the vertex angle. • The third side is the base of the isosceles triangle. • The two angles adjacent to the base are called base angles.

  3. Base angles theorem • Two sides of a triangle are congruent if and only if the angles opposite them are congruent.

  4. Copy and complete each statement

  5. Corollary to the base angles theorem • A triangle is equilateral if and only if it is equiangular.

  6. Find the values of x and y in the diagram

  7. Find the values of x and yin the diagram. GUIDED PRACTICE

  8. Assignment • pg. 267: 3-9, 15-17

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