# 6.8: Understanding the Angle Measures of Quadrilaterals

Difficulty Level: At Grade Created by: CK-12
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### Vocabulary Language: English

TermDefinition
Congruent Congruent figures are identical in size, shape and measure.
Parallelogram A parallelogram is a quadrilateral with two pairs of parallel sides.
Quadrilateral A quadrilateral is a closed figure with four sides and four vertices.
Rectangle A rectangle is a quadrilateral with four right angles.
Rhombus A rhombus is a quadrilateral with four congruent sides.
Square A square is a polygon with four congruent sides and four right angles.
Trapezoid A trapezoid is a quadrilateral with exactly one pair of parallel opposite sides.

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