A rhombus is a four sided equilateral parallelogram meaning that each is 20 cm long. So to find the perimeter simply calculate the distance it takes to travel around the entire surface.
4*20cm = 80cm
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100 is the answer.
The perimeter of a rhombus with side 7 is 28 units.
The perimeter is 5 times the side length. A = 5s
Side length x 6 = perimeter
Divide the perimeter by eight.