Question

The diameter of a £1 coin is 22.5 mm. Work out its circumference to the nearest centimetre.Required to answer. Single choice.

(2 Points)
68
70
7
11

Answer 1

7

Explanation:

Circunference:

The circunference of a circle with diameter d is given by:

`C = d\pi`

The diameter of a £1 coin is 22.5 mm.

Each mm has 0.1 cm, so the diameter, in cm, is of d = 2.25. Then

`C = 2.25\pi = 7`

The circunference is of 7 centimeters.