MelO
Find the length of a side of a square whose diagonal is 4 cm



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amistre64
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what do we know about the properties of a square that would help us use the pythag thrm here?

Taz666
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c^2 = a^2 * b^2
c=diagonal, a and b are the sides. But since this is a square, a and b are equal.

Taz666
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Now do a little algebra...

amistre64
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a^2 + b^2 that is :)

phani09
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dw:1359727230314:dw

MelO
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Thank you guys

Taz666
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Sorry, typo *blushes*

MelO
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would you take 4^2 +45^2

MelO
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or 4^2 + 8^2