Chapters

A quadrilateral is a polygon with four sides.

A quadrilateral has two diagonals.

The sum of the interior angles of a quadrilateral equals 360º.

## Types of Quadrilaterals

### Parallelograms

A parallelogram is a quadrilateral which has parallel sides in pairs. They are classified as follows:

## Square

A square has 4 equal sides and 4 right angles.

## Rectangle

A rectangle has equal opposite sides and 4 right angles.

## Rhombus

A rhombus has four equal sides and equal opposite angles.

## Rhomboid

A rhomboid has opposite sides that are parallel and equal.

### Trapezoid

Trapezoids are quadrilaterals with only two parallel sides. They are classified as follows:

## Right Trapezoid

A right trapezoid has two right angles.

## Isosceles Trapezoid

An isosceles trapezoid has two of its non-parallel sides equal in length.

## Scalene trapezoid

A scalene trapezoid doesn´t have equal sides or angles.

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