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January 30, 2015

January 30, 2015

Posted by **Jen** on Sunday, March 13, 2011 at 10:54pm.

- geometry -
**MathMate**, Sunday, March 13, 2011 at 11:08pmPerimeter = 120 cm

Length of each side = 120/4 = 30

Let the diagonals be x and 2x.

Use Pythagoras theorem to calculate each side in terms of the half diagonals, x/2 and x.

30 = sqrt((x/2)²+x²)

Square both sides:

900 = (x/2)²+x²=(5/4)x²

x²=720

x=?

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