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Triangles as Parts of Rectangles, , If we draw a diagonal of a rectangle then we get two, equal sizes of triangles. So the area of these triangles, will be half of the area of a rectangle., , The area of each triangle = 1/2 (Area of the, rectangle), , Likewise, if we draw two diagonals of a square then, we get four equal sizes of triangles .so the area of, each triangle will be one-fourth of the area of the, square.