ISEE Middle Level Math : How to find the perimeter of a parallelogram

Example Questions

Example Question #1 : How To Find The Perimeter Of A Parallelogram

18 in

36 in

13 in

26 in

26 in

Explanation:

To find the perimeter of a parallelogram, add the lengths of the sides. Opposite sides of a parallelogram are equivalent. Example Question #1 : Parallelograms Note: Figure NOT drawn to scale. Find the perimeter of the parallelogram in the diagram.      Explanation:

The perimeter of the parallelogram is the sum of the four side lengths - here, that formula becomes .

Note that the height is irrelevant to the answer.

Example Question #3 : How To Find The Perimeter Of A Parallelogram

If the perimter of a parallelogram is and one of the sides is , what is the other side length?

The answer cannot be found     Explanation:

The perimeter of a parallelogram is found by adding up all four sides.

Since there are two pairs of side with equal lengths, two sides must have a length of .

So the perimeter would be or .

To find the value of the other side length, you would divide the remaining perimeter not include in the other sides by .

So .

That means the other side length would be .

Example Question #1 : How To Find The Perimeter Of A Parallelogram

If a parallelogram has side lengths of and , what is the perimeter?     Explanation:

The perimeter of a parallelogram is two times the two side lengths and add them together. Therefore, this particular problem becomes as follows. and so .

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