math question 7th grade! (easy)?

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Mindy

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this is on my math homework and i need some help

EXPLAIN how to find the measure of 1 side of a square if its area is 64 sq. cm. (i know the answer is 8 cm. but i don't know how to explain it)
 
The sides of a square are all equal. Since we know the area is 64 we simply have to square root it (8) and that's it.
This works cause to get the area of a square you times 2 sides together, to prove it if needed:

square root of 64 = 8
8*8 = 64
 
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