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# Calculate The Perimeter Of An Isosceles Trapezium/Trapezoid

Last updated: Saturday, June 24, 2023
Select a specific type of trapezium/trapezoid below
Basic
Isosceles Trapezium
Right Trapezium

The perimeter of an isosceles trapezium is the sum of the lengths of all its sides. An isosceles trapezium is a quadrilateral with two parallel sides of equal length and two non-parallel sides. The perimeter can be calculated by adding the length of the two parallel sides and the sum of the lengths of the two non-parallel sides.

For example, if the isosceles trapezium has parallel sides of length 5 units and 9 units, and the two non-parallel sides have lengths of 4 units each, then the perimeter would be:

Perimeter = 5 + 9 + 4 + 4 = 22 units

Therefore, the perimeter of an isosceles trapezium is dependent on the length of its sides and the parallel sides must be of equal length.

The formula for determining the perimeter of an isosceles trapezium/trapezoid is defined as:
$$P$$ $$=$$ $$AB$$ $$+$$ $$CD$$ $$+$$ $$2$$ $$\cdot$$ $$AD$$ $$=$$ $$AB$$ $$+$$ $$CD$$ $$+$$ $$2$$ $$\cdot$$ $$BC$$
$$P$$: the perimeter of the trapezium/trapezoid
$$AB$$: the length of side AB
$$BC$$: the length of side BC
$$CD$$: the length of side CD
The SI unit of perimeter is: $$meter\text{ }(m)$$

## Sides Given

Use this calculator to determine the perimeter of an isosceles trapezium/trapezoid when the lengths of its sides are given
Hold & Drag
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the length of side AB
$$AB$$
$$meter$$
the length of side BC
$$BC$$
$$meter$$
the length of side CD
$$CD$$
$$meter$$
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