Question

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

Answer 1

Answer:

7

Step-by-step 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.