Area: Area is the amount of space inside a two-dimensional shape, usually measured in square units. Rectangle: A rectangle is a simple four-sided shape with two pairs of parallel sides.

Revise how to calculate the area of a triangle. Learn how to calculate the triangle's area by first finding the area of a rectangle in this BBC Bitesize maths guide.

We can work out the area of a triangle by working out the area of a rectangle and then dividing it by two. Discover more in this Second Level Bitesize guide.