# Rectangle Class

You are asked to design a

`Rectangle`

class in Python. This class should have two attributes:`height`

- which represents the height of the rectangle

`width`

- which represents the width of the rectangle

The class should also include two methods:

`area`

- a method that calculates and returns the area of the rectangle, which is the product of the`height`

and the`width`

.

`perimeter`

- a method that calculates and returns the perimeter of the rectangle. The formula to calculate the perimeter is`2 * (height + width)`

.

`diagonal`

: a method that computes and returns the length of the diagonal of the rectangle.

💭

Remember the Pythagorean theorem

Input | Output |

`r = Rectangle(10, 5); print(r.area())` | 50 |

#### Constraints

Time limit: 0.2 seconds

Memory limit: 512 MB

Output limit: 1 MB