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Question

The length of the side of a square with an area of 1600m2 is ____.

A
80m
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B
44m
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C
30m
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D
40m
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Solution

The correct option is D 40m

If the side of square is a, its area is a2.

According to question,

a2=1600
a2=2×2×2×2×10×10
a=2×2––––×2×2––––×10×10––––––

2×2×10
a=40m


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