A two-dimensional diamond shape is also known as a rhombus. A rhombus is akin to a square in that it has four sides with the same length, but unlike those of a square, the sides of a rhombus do not have to intersect at 90-degree angles. The perimeter of any enclosed two-dimensional object is the distance around its exterior. Calculating the perimeter of a rhombus or diamond is simple because of its equal-length sides.

Find the length of one of the diamond's sides. For this example, the length is 45.

Multiply the length by 4 to calculate the diamond's perimeter. For this example, 45 times 4 is 180.

Add each side together to check your answer. For this example, 45 added to itself four times equals 180.

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About the Author

Chance E. Gartneer began writing professionally in 2008 working in conjunction with FEMA. He has the unofficial record for the most undergraduate hours at the University of Texas at Austin. When not working on his children's book masterpiece, he writes educational pieces focusing on early mathematics and ESL topics.

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