Posted by Jen on Sunday, March 13, 2011 at 10:56pm.
Diagonal forms right triangle, with sides of square as two of the sides. Use Pythagorean theorem.
a^2 + b^2 = (10√2)^2
However, since a = b,
2a^2 = (10√2)^2
Perimeter = 4a
I'll leave the calculations for you.
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