Enter the lengths of all four sides of the trapezoid into the calculator to determine its perimeter; this calculator can also evaluate any of the side lengths given the perimeter is known.

## Perimeter Of A Trapezoid Formula

The following formula is used to calculate the perimeter of a trapezoid:

P = a + b + c + d

Variables:

- P is the perimeter of the trapezoid
- a is the length of the first parallel side
- b is the length of the second parallel side
- c is the length of the first non-parallel side
- d is the length of the second non-parallel side

To calculate the perimeter of a trapezoid, add the lengths of all four sides together.

## What is a Perimeter Of A Trapezoid?

The perimeter of a trapezoid is the sum of the lengths of all its four sides. A trapezoid is a four-sided polygon with one pair of parallel sides known as the bases and two non-parallel sides known as the legs. To calculate the perimeter of a trapezoid, you simply add the lengths of these four sides together. This is true regardless of whether the trapezoid is right-angled, isosceles, or scalene. The formula for the perimeter of a trapezoid is P = a + b + c + d, where a and b are the lengths of the bases, and c and d are the lengths of the legs.

## How to Calculate the Perimeter Of A Trapezoid?

The following steps outline how to calculate the Perimeter of a Trapezoid.

- First, determine the length of the two parallel sides of the trapezoid (a and b).
- Next, determine the length of the two non-parallel sides of the trapezoid (c and d).
- Next, add the lengths of all four sides of the trapezoid together (a + b + c + d).
- Finally, calculate the Perimeter of the Trapezoid.
- After inserting the values and calculating the result, check your answer with the calculator above.

**Example Problem:**

Use the following values as an example problem to test your knowledge.

Length of parallel side a = 8

Length of parallel side b = 12

Length of non-parallel side c = 5

Length of non-parallel side d = 7