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As we're learning about the properties of polygons, we need to know what the area of a polygon is.

As we're learning about the properties of polygons, we need to know what the area of a polygon is.

### Area

The area of a polygon is the quantity that expresses the extent of a shape. It is two-dimensional and is normally calculated by multiplying the length and the height of the shape.

The typical shape of rooms and other spaces are not just a rectangle or a square, so we'll need to add the areas of the shapes that compose them:

Other problem we may have is when the area we want to measure is a shape within another shape:

In this case, we need to subtract the area of the outside rectangle minus the area of the small one, in order to know the difference between them.

#### Area of a paralellogram

Paralellograms are always measured as if they were rectangles:

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