# Rectangle

*(Jump to Area of a Rectangle or Perimeter of a Rectangle) *

A rectangle is a four-sided flat shape where every angle is a right angle (90°).

means "right angle" |
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are equal sides |
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are equal sides |
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Each internal angle is 90° | |

Opposite sides are parallel and of equal length (so it is a Parallelogram). |

Play with a rectangle:

## Area of a Rectangle

The Area is the Area = w × h |

### Example: A rectangle is 6 m wide and 3 m high, what is its Area?

Area= 6 m × 3 m

=

**18 m**^{2}## Perimeter of a Rectangle

The Perimeter is the distance around the edges.

The Perimeter is Perimeter = 2(w+h) |

### Example: A rectangle has a width of 12 cm, and a height of 5 cm, what is its Perimeter?

Perimeter = 2 × (12 cm + 5 cm)

= 2 × 17 cm

=

**34 cm**## Diagonals of a Rectangle

A rectangle has two diagonals, they are equal in length and intersect in the middle. |

The Diagonal is the Diagonal "d" = √(w |

### Example: A rectangle has a width of 12 cm, and a height of 5 cm, what is the length of a diagonal?

d = √(5

^{2}+ 12^{2}) = √(25 + 144)

= √169

=

**13 cm**## Golden Rectangle

There is also a special rectangle called the Golden Rectangle: