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## Definition:

The term **quadrilateral** can be simply defined as a two-dimensional closed figure with four sides. Basically, there are two-dimensional shapes classified under quadrilaterals such as square which has a certain property.

## Summary:

In geometry, a quadrilateral is defined as a closed, two-dimensional shape which has four straight sides.

**PROPERTIES OF QUADRILATERALS**

- A quadrilateral has 4 sides, 4 angles, and 4 vertices
- A quadrilateral can be regular or irregular
- The sum of all the interior angles of a quadrilateral is 360°

**TYPES OF QUADRILATERALS**

**PARALLELOGRAM**– Opposite sides are parallel and equal. Opposite supplementary angles are equal.**SQUARE**– All sides are equal. All right angles are equal and measure 90°.**RECTANGLE**– Opposite sides are parallel and equal. Opposite right angles are equal and measure 90°.**RHOMBUS**– All sides are equal. Opposite angles are equal.**TRAPEZOID**– Only one pair of opposite sides are parallel. Adjacent angles add up to 180°.

## Understanding Properties of Quadrilaterals Worksheets

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