# Area

In this section of Revision Maths, you will learn how to work out the area of the following shapes: Triangle, Rectangle, Parallelogram, Trapezium and Circle.

Area is a two Dimensional Measurement. In most countries it is measured using metric measurements such as MM^{2} CM^{2} M^{2} KM^{2}.

When calculating areas remember to make sure that you use the same units of measurement e.g. CM and write the correct square unit in your answer e.g. CM^{2}.

**The Areas of Shapes**

**Triangle**

To calculate the area of a triangle you use the following formula: A= ½ bh

½ b is half the base length of the triangle and h is the height of the triangle. So you multiply ½ the base length by the height.

**Rectangle**

To calculate the area of a rectangle you use the following formula: A = bh

This means you just multiply the base length by the height.

**Parallelogram**

The area of a parallelogram is calculated in exactly the same way as the area of a rectangle A = bh

**Trapezium**

The area of a trapezium can be calculated using the following formula: A = ½ (a + b)h

So you add half the top length (a) and half the base length (b) together and multiply these by the height (h).

**Circle**

The area of a circle is calculated using this formula: A = πr^{2}

^{}

π is the Greek letter pi (use the π symbol on your calculator) then times pi by the radius of the circle (r) squared.