6.1 Perimeter

Perimeter is the size of the length that surrounds a shape. There are a bunch of perimeter formulae for some common shapes that you need to be familiar with:

• Perimeter of circle: 2πr
• Perimeter of semi-circle: πr
• Perimeter of square: 4a (where a is length of each side)
• Perimeter of rectangle: 2 × (length + width)
• Perimeter of triangle: sum of the three sides.

Example 1

Calculate the perimeters of the following shapes.

The following is the type of questions you can expect in exam:

– 6.1.1 Exam Question Type 1

Study notes of this section and other resources can be accessed here:

– 6.1.2 Study Notes & Resources