NZ Level 7 (NZC) Level 2 (NCEA)
Perimeter of Circles and Sectors

## Interactive practice questions

If the radius of a circle equals $27$27 cm, find its circumference correct to one decimal place.

Easy
Less than a minute

The circumference $C$C of a circle is equal to $132$132 cm and its radius is $r$r cm long. Using the approximation $\pi=\frac{22}{7}$π=227, find the value of $r$r to the nearest integer.

A circular running track has a diameter of $23$23 metres. How many laps must be completed to run $1600$1600 metres?

What is the perimeter of a semicircle with diameter $8$8 cm, correct to 2 decimal places?

### Outcomes

#### M7-4

Apply trigonometric relationships, including the sine and cosine rules, in two and three dimensions

#### 91259

Apply trigonometric relationships in solving problems