Unit 9 Section 5 : The Area of a Triangle
This section introduces the formula for the area of a triangle, which can be seen below.
The height is called the perpendicular height because it is at a rightangle to the base.
Below is an example of the formula being used to find the area of a triangle.
Example Question
Below are two triangles, each with their base and perpendicular height indicated.

Practice Questions
Work out the answer to each of these questions then click on the button marked
to see whether you are correct.
What is the area of triangle A?
What is the area of triangle B?

Exercises
Work out the answers to the questions below and fill in the boxes. Click on the
button to find out whether you have answered correctly. If you are right
then will appear and you should move on to the next
question. If appears then your answer is wrong. Click
on to clear your original answer and have another go.
If you can't work out the right answer then click on
to see
the answer.
Question 1
Find the area of each of these triangles.
Question 2
Find the areas of the shapes below.
In each case, you will need to divide the shape into one rectangle and one triangle, then add the areas together.
Dashed lines have been included on each shape to help you with this.
You have now completed Unit 9 Section 5
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Produced by A.J. Reynolds January 2001