Areas of Parallelograms, Triangles, and Trapezoids

Concept

Isosceles Trapezoid

An isosceles trapezoid is a trapezoid whose legs are congruent.

Isosceles trapezoids have two main properties.

Property Justification
The diagonals are congruent. Isosceles Trapezoid Diagonals Theorem
Each pair of base angles is congruent. Isosceles Trapezoid Base Angles Theorem
Exercises
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