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4-5: Isosceles and Equilateral Triangles

4-5: Isosceles and Equilateral Triangles. Isosceles Triangles – 2 sides congruent. A. Legs – the two congruent sides Base – the 3 rd side (not congruent) Vertex Angle – angle included between the two legs

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4-5: Isosceles and Equilateral Triangles

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  1. 4-5: Isosceles and Equilateral Triangles

  2. Isosceles Triangles – 2 sides congruent A • Legs – the two congruent sides • Base – the 3rd side (not congruent) • Vertex Angle – angle included between the two legs • Base Angles – the other two angles (each is included between a leg and the base) C B

  3. Isosceles Triangles • The base angles are always congruent (the angles across from the legs) • The bisector of the vertex angle is also the perpendicular bisector of the base.

  4. Find the value of y. M y° N O 63° L

  5. Find the values of the variables. x° 125° w° y° z°

  6. Find the values of the variables. c° a° 30° b°

  7. Find the values of x and y. y° x° 55°

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