Area and Perimeter
Every question comes with the shape drawn. Start by counting squares, move on to labelled sides, and finish by working backwards to find a side you are not told.
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Saving your progress
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Telling the two apart
Nearly every mistake in this topic is doing the other one. It helps to say what each word means before reaching for a number.
- Perimeter is the walk round. If you walked all the way round the edge of the shape, how far did you go? A rectangle has two pairs of equal sides, so it is the two different sides added, then doubled.
- Area is the space inside. How many squares would it take to cover it? That is why the early questions draw the squares — you can count them, and the formula is just a shortcut for that counting.
- Check the units. Perimeter is a length, so it is centimetres. Area covers a surface, so it is square centimetres. If the units of your answer do not match the question, you have done the other one.
School levels
School levels are a guide only. They show where a skill is usually taught in each country and are not taken from, aligned to, or endorsed by any curriculum authority. Your school may cover it earlier or later.