The diagonal of a square is 12 cm long, find the value of its area

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Solution

d= $\sqrt{2}$ a
12= $\sqrt{2}$ a
a=6 $\sqrt{2}$

Area = $a^{2}$
$A r e a = 72 c m^{2}$

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The diagonal of a square is $12 c m$ long. find its area and length of one side.

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