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x²+y²=2 x 10=20 (Pythagore theory)
2x²=2y(P. Theory)
Gives x²=y
So
x²+x²
x²=20
x=2
Surface of cube
S= 6*x²=6x4=24

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You forgot to square the 10 (instead of 2x10) in the first line.

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That s true ;)

Your proportions are not correct. If X and X is the same size, the right side would have to be much shorter.

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Yes true Im not the best artist but should be clear no ? I also wrote its a cube :)

Thanks for info!

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What info :) ?

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This photo is interesting.

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