![]() Join the midpoints of the sides in order and you get a parallelogram whose sides are parallel to the diagonals.Join the opposite sides of a rectangle and you get four congruent rectangles of one-fourth the size of the main rectangle. ![]() land of different shapes such as rectangles, circles, or even pentagons. An easy to use, free perimeter calculator you can use to calculate the perimeter of shapes like square, rectangle, triangle, circle, parallelogram, trapezoid, ellipse, octagon, and sector of a circle.
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