Triangles

Look at the triangle below:

Area of a triangle diagram

If you multiply the base by the perpendicular height, you get the area of a rectangle. The area of the triangle is half the area of the rectangle.

So, to find the area of a triangle, multiply the base by the perpendicular height and divide by two. The formula is:

Area = \frac{(b \times h)}{2}

Remember to only use the perpendicular height of the triangle in place of {h}.

Question

Find the area of this triangle:

Area of a triangle diagram

The area of the triangle is:

A=\frac{({b}\times{h})}{2}

=\frac{(5\times8)}{2}=\frac{40}{2}

={20~cm}^2