What is area
Area is the size of a two-dimensional surface; it is the width multiplied by the length. Area is measured in unit squares, like m2 or square feet.
The red shape below has an area of 6, the orange shape has a surface area of 4 and the blue one 8. For example, a rectangle which has width 8 and height 15 has a surface area of 8*15=120.

Surface area