l+b+H of a cuboid =19cm .length of diagonal is 5*root5 .Find its surface area
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root of (l^2+b^2+H^2)=5root5
l^2+b^2+H^2=125
and l+b+H=19
apply (a+b+c)^2 formula
and find 2( lb+bh+hl)
236
l^2+b^2+H^2=125
and l+b+H=19
apply (a+b+c)^2 formula
and find 2( lb+bh+hl)
236
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