Isosceles and equilateral triangles

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  1. Find x.

    1. equilateral triangles and angles inside the triangles

    2. determining the side length of equilateral triangles

    3. Isosceles and equilateral triangles

    4. Isosceles triangles
  2. In △DEF\triangle DEF, EY‾\overline {EY} is a perpendicular line to DF‾\overline {DF} and YY is the midpoint of DF‾\overline {DF}. Why is △DEF\triangle DEF an isosceles triangle? Show your reasoning.
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