To be able to calculate all values of an isosceles trapezoid, you must know the value of at least one of the base sides.

In our case, the long side (a) is the bottom base and the short side (b) is the top base of the trapezoid. These two sides are known as the bases of the isosceles trapezoid. The long and short sides are the two sides that are parallel to each other. There are eight parts of an isosceles trapezoid mentioned in this tool: long side (a), short side (b), legs (c), height (h), area (A), perimeter (P), diagonal (d) and circumradius (R). If the legs are also parallel to each other, then we get a parallelogram. The two parallel sides are called bases, and the other two sides are called legs. An isosceles trapezoid (or trapez) is a trapezoid with legs that have equal length.Ī trapezoid is a geometric shape with four sides, where at least one pair of sides is parallel to each other.