A rectangle is a 4-sided flat shape made of straight sides, where all four of its interior angles are 90°.

From these simple facts, it is not hard to work out these related facts:

**Opposite sides are parallel.**

The sides with a single arrow are parallel to each other.

The sides with double arrows are parallel to each other.

**Opposite sides are equal.**

The sides with a single dash are equal in length to each other.

The sides with a double dash are equal in length to each other.

**There are 2 lines of symmetry.**