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Another by rearrangement is given by the middle animation. A large square is formed with area c 2 , from four identical right triangles with sides a , b and c , fitted around a small central square. Then two rectangles are formed with sides a and b by moving the triangles. Combining the smaller square with these rectangles produces two squares of areas a 2 and b 2 , which must have the same area as the initial large square
