Answer the following question given this paragraph: 

The area of a surface is how much space it covers. It’s easy to calculate the area of a surface if it has a regular shape, such as the blue rectangle in the sketch below. You simply substitute measurements of the surface into the correct formula. To find the area of a rectangular surface, use this formula:.


Q: How much space a surface covers is known as what?

 Choices:

- Flatness

- Lenght

- Height

- area

A:
area
