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

## Example Questions

### Example Question #264 : Geometry

Find the perimeter of the parallelogram.

18 in

13 in

26 in

36 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 #2 : 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 #1 : Parallelograms

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

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 #3 : Parallelograms

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

.