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# Quadrilateral Trapezoid Homework Help

## Need more help understanding quadrilaterals?

❶This study guide gives students the formulas needed to calculate the area of a parallelogram and area of a trapezoid. A rectangle is a parallelogram with 4 right angles.

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## Main Topics

A quadrilateral is a parallelogram if both pairs of its opposite sides are parallel. A rhombus is a type of quadrilateral with all sides the same length. A rectangle has 4 right angles, and a square has four equal sides and four right angles. These definitions exist in a .

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A trapezoid also called a trapezium is a quadrilateral in which a pair of opposite sides is parallel. A trapezium becomes an isosceles trapezium if its sides which are not parallel are equal in length.