It could be the formula for 2 times the area of a trapezium, where
A = Area
b1 and b2 are the lengths of the parallel sides
and h is the vertical distance (height) between them.
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(a+b)2 = a2+2ab+b2
1) A famous mathematician. 2) The word is often used for the relationship a2 + b2 = c2. This applies to a right triangle, assuming "c" is the longest side (the side opposite the right angle).
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