Properties of an Isosceles Trapezoid

An Isosceles Trapezoid has two parallel bases, the leg lengths are equal, and the base angles are also congruent.
An isosceles trapezoid has legs of equal length and one pair of parallel sides
The parallel sides are called bases and the nonparallel sides are legs
An isosceles triangle has base angles equal or congruent
The height which is an altitude is a perpendicular line from base to base
The angles at the top of the base and the bottom of the base are congruent
Adjacent base angles are supplementary
In order to find the perimeter add the length of all sides
The area is equal to the average of the two bases times the height.

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