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Dch · Answer 1 · 2018-04-21T01:55:01+0000

I would recommend using:
a2 + b2 = c2

a and b are the legs, and c is the hypotenuse( or diagonal)

9•9
40•40

81+1600=c2
1681=c2
c=41

So the diagonal is 41units

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