# What is *area*?

**Area**is the space occupied by a flat shape or the surface of an object. The area of a shape can be measured by comparing the shape to squares of a fixed size. In the International System of Units (SI), the standard unit of area is the square meter, which is the area of a square whose sides are one meter long.

## Input

**Square Foot**is a unit of area, equal to the area of a square with sides of one foot, which is exactly 144 square inches or 1/9 of a square yard.

## Output

**Square Kilometer**is the area inside a square that has each side equal to 1 kilometer (1000 meters).