*(This is totally not to scale. Sorry. Drawing with a mouse is hard!)*

Note that the little triangle in the middle is

*also*equilateral. We can use that to fill in all our distances. The bases of the big triangles (*CE*and*DF*on your diagram) are both 20, so all the sides of the big triangles will be 20. The smaller triangle will have sides of 10 inches each. That means we're cutting the overlapping sides in half:To find our perimeter and finish the question, just count up all the sides that are bolded.

**They add up to 90.**
I think we need more explanation.

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