# Euclidean geometry/Parallel lines, quadrilaterals, and circles

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## Contents

## Summary of Chapter[edit]

To understand the properties of parallel lines, quadlaterals and circles.

## Quadrilaterals[edit]

A quadlateral is defined as any 4 sided polygon.

### Special quadrilaterals[edit]

#### Parallelograms[edit]

A parallelogram is a quadrilateral with equal opposite angles and opposite sides with equal length.

#### Rectangles[edit]

A Rectangle is a parallelogram with all right angles.

#### Squares[edit]

A square is a rectangle in which the lengths of all the sides are equal.

## Circles[edit]

A circle is the set of points in a plane that are a given distance from a given point, the center. The distance between any of the points and the center is called the radius.