Trapezoid
a quadrilateral with only ONE PAIR of parallel sides
A trapezoid is a quadrilateral with two parallel sides (bases) of different lengths. The non-parallel sides are called legs, and the distance between the two parallel sides is called the height. The formula to calculate the area of a trapezoid is:
Area = (sum of bases) x height / 2
If the trapezoid is isosceles, meaning that the legs are of equal length, then the formula for area simplifies to:
Area = base x height / 2
To find the perimeter of a trapezoid, add up the lengths of all four sides. If the trapezoid is isosceles, meaning that the legs are of equal length, then the formula for perimeter simplifies to:
Perimeter = 2 x base + 2 x leg
It’s important to note that a trapezoid is different from a parallelogram, which is also a quadrilateral with two pairs of parallel sides. In a parallelogram, opposite sides are equal in length and opposite angles are equal in measure. In a trapezoid, however, the two bases are of different lengths and the angles are not necessarily equal.
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