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# The Basics of Quadrilaterals Practice Questions

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Review these concepts at The Basics of Quadrilaterals Study Guide.

## The Basics of Quadrilaterals Practice Questions

### Practice

1. Identify all the names that describe this quadrilateral.

2. Find the value of x in this parallelogram.

### Solutions

1. Parallelogram; opposite sides are equal.

Rectangle; it has four right angles.

Rhombus; all sides are congruent.

Square; the sides are congruent and the angles are all 90 degrees.

2. The opposite angles are equal. Because angle H is 120 degrees, angle K must also be 120 degrees. There are 360 degrees in any quadrilateral, so the other angles (G and J) must add up to 360 –120 (angle K) –120 (angle H):

360 –120 –120 = 120

Angles G and J are equal, so to find x, divide 120 by 2: x = 60 degrees.

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