diagonal = square root ( side squared + side squared) = square root (2) x side
(pythagorean theorem since angle is 90degrees)
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Area in square units = pi*radius2
a square + b square = c square this is the formula for Pythagoras in maths. it is to find the hypotenuse of a right-angled triangle
When you think about it for a while, they're really NOT different. The rectangle formula needs a bit more detail, because its sides don't all have the same length, so its length and its width have to be handled separately. But the rectangle formula works perfectly well if you use it to find the perimeter of a square.
In UK terms:- Area = 0.5*(sum of parallel sides)*height and measured in square units
lengthXwidth