Did you play one of these at school when you were younger?

The good old days of the** triangle** before they became bothersome in maths questions.

What examples can you think of that we see in everyday life?

Builders may use this a lot for working out areas of gable ends of houses.

You may need the area for cutting patterns in the shape of a triangle to make bunting, or make a kite

Before we can do any of this there is one thing we need to know and that is how to find the area of a triangle.

First we are going back to look at finding the area of a square and rectangle. Why? It may help to understand and remember the formula for the area of a triangle

**Area of a rectangle =base x height**

Yes, really that is all there is to it.

Look what happens when a diagonal line is drawn from one corner of the rectangle to the other. By cutting it in half I have made triangles. Cutting it in half is the same as dividing by 2.

Area = base x height ÷ 2

or another way of writing this is

Area = 1/2 base x height

Now you could go barking up the wrong tree, so be careful!

When you are given measurements for a triangle you are sometimes given the base, vertical height and a slanted height.

You always want the **vertical height.**

The area of this triangle is the base of 4 x vertical height of 3 = 12

12 ÷ 2 = 6 units²

Once you have learned the formula you are flying!