Isosceles and equilateral triangles

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Examples

Lessons

Find x.
In $\triangle DEF$ $△ D EF$ , $\overline {EY}$ $\overline{E Y}$ is a perpendicular line to $\overline {DF}$ $\overline{D F}$ and $Y$ $Y$ is the midpoint of $\overline {DF}$ $\overline{D F}$ . Why is $\triangle DEF$ $△ D EF$ an isosceles triangle? Show your reasoning.

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