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2015-05-24T19:11:53+08:00

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The area of a square is computed as s^2 where s is the side length.
So:
400=s^2 \\ 20=s

We do not have -20 because there is never a side length that is negative.

Therefore the side length is 20 m.
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2015-05-24T20:07:22+08:00

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Certified answers contain reliable, trustworthy information vouched for by a hand-picked team of experts. Brainly has millions of high quality answers, all of them carefully moderated by our most trusted community members, but certified answers are the finest of the finest.
The formula for the area of a square:
A=s²

Substitute with the given measurements:
400 m²=s²
Square root both sides
s=20 m

It cannot be s=-20 m because there are no negative length. Hope this helps =)
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