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Concept

Isosceles Trapezoid

An isosceles trapezoid is a trapezoid whose legs are congruent.
An isosceles trapezoid is depicted with parallel upper and lower sides, and equal-length sides on the right and left.

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
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