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ktklown
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do you want the answer only or to learn how to do it?

ktklown
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well the perimeter is just the sum of the lengths of the sides

ktklown
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Yes, i get 18 sqrt(3) also

ktklown
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Yes, because you can't simplify sqrt(3) any further like you did with sqrt(75).

ktklown
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None of the factors of 3 are perfect squares, so it can't be simplified. In fact, 3 has no factors at all  it's prime

ktklown
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Yeah, computing the actual square roots means it's about 8.7 feet by 7 feet ... so a table is about that size.

AriPotta
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ok, thanks :)

ktklown
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looks good to me!