If you put two of ANY triangle hypotenuse to hypotenuse the shape will have 4 sides (thus a parallelogram or quadrilateral).
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If the heights and bases are the same, then the triangle is half the area of the parallelogram.
you do it because the triangle is half the size of the parallelogram
Because base times height = the area of a parallelogram and a triangle's area is half that of the parallelogram that the triangle exactly fits into.
To get the area it half breadth by height. A simplified thought on this is because the formula for the area of a parallelogram is length by width, and a triangle would be half of this
They involve only the base and vertical height.The formula for a triangle is half that for the corresponding parallelogram.