Trapezoid Side Calculator: Find the Unknown Side Length of a Trapezoid

In geometry, a side can be defined as a line connecting two vertices of a figure or two-dimensional figure. Our online calculator will help you find the side, edge of more than 11 shapes.

Quadrangle — in which two sides are parallel and the other two sides are not parallel is called a trapezoid. Parties that are not parallel are called the sides of the trapezoid.

If you need to find the length of one of the sides of a trapezoid, our free online trapezoid side calculator can help. Simply input the length of the one base and the length of the middle line, and our calculator will find the length of the unknown side.

Trapezoid Side Formulas

The formula to calculate the length of a side of a trapezoid is:

s = \sqrt{m^2+(b - a)^{\frac{2}{4}}}

The formula to calculate the length of a base of a trapezoid is:

b = 2m - a

where s is the length of the unknown side, m is the length of the middle line, and a and b are the lengths of the two parallel sides of the trapezoid.

Example Problems

Here are some examples of how to use the trapezoid side formula to find the length of a side of a trapezoid.

Example 1

Find the length of side in a trapezoid where b = 8, a = 6, and m = 5.

We can use the trapezoid side formula to solve for a:

s = \sqrt{m^2+(b - a)^{\frac{2}{4}}}

s = \sqrt{5^2+(8 - 6)^{\frac{2}{4}}}

s ≈ 3.17

Therefore, the length of side a is approximately 3.17 units.

Example 2

Find the length of side b in a trapezoid where a = 6, and m = 7.

b = 2m - a

b = 2*7 - 6

b =8

Therefore, the length of side b is 8 units.

Use our free online calculator to find the length of the unknown side of a trapezoid. Simply enter the length of the one side and the length of the middle line, and our calculator will use the trapezoid side formula to find the length of the unknown side.

Using our calculator can save you time and prevent calculation errors. Try it out today!