Key learning points

1. Using fractions, you can calculate part of the circumference.
2. This gives the length of the curved section of a sector.
3. To find the perimeter, you will need to add the radius twice.
4. An exact answer may be given in terms of π

Common misconception

Keywords

• Arc - An arc is part of a curve. An arc of a circle is part of the circle’s circumference.

• Sector - A sector is the region formed between two radii and their connecting arc.

• Chord - A chord is any line segment joining two points on the circumference of a circle.

• Radius - The radius is any line segment that joins the centre of a circle to any point on its circumference.

• Circumference - The circumference of a circle is the perimeter of the circle.