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Properties of Trapezoids

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Videos, worksheets, solutions, and activities to help Geometry students learn about the properties of trapezoids.

Properties and Parts of Trapezoids
Trapezoids are one of the most common quadrilaterals. A trapezoid has one pair of parallel sides. When a trapezoid has two sets of parallel sides, it is a more specific type of trapezoid called a parallelogram. A more specific type of trapezoid is called an isosceles trapezoid. In addition to one pair of parallel sides, isosceles trapezoid properties include congruent legs, base angles and diagonals.

Trapezoid Lecture
Definition of a Trapezoid
Students learn the definitions of a trapezoid, an isosceles trapezoid, and the median of a trapezoid. Students also learn the following theorems related to trapezoids. The base angles of an isosceles trapezoid are congruent. The median of a trapezoid is (a) parallel to the bases and (b) has a length equal to the average of the lengths of the bases. Students are then asked to solve problems related to these concepts using Algebra.


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