In this activity, we will find the areas of triangles, parallelograms and trapeziums.

Here's a reminder of the formulae for finding them:

Area of parallelogram = base x vertical height

In the example above, the base is 10 cm and the vertical height is 6 cm.

The area is 10 x 6 = 60 cm²

Area of triangle = ½ base x vertical height

In the example above, the base is 10 cm and the vertical height is 8 cm.

The area of the triangle is 1/2 x 10 x 8 = 40 cm²

Area of trapezium = Average of parallel sides x vertical height

This is also written as 1/2 (a + b) x h where a and b are the two parallel sides

In the example above, the two parallel sides are 6 cm and 12 cm, so the average is 6 + 12 = 18 ÷ 2 = 9

The vertical height is 8 cm

The area is 9 x 8 = 72 cm²

Remember that areas are always **squared **units of measurement - in all these examples, they are in cm²

Let's have a go at the questions.

*If you need to check back to this page to remind yourself of the formulae, just click on the pink button on the right of the screen at any time.*