Problem
The circumference of the circle below is \( 15 \mathrm{~cm} \). Work out the diameter of the circle. Give your answer in centimetres \( (\mathrm{cm}) \) to 1 d.p. circumference \( =15 \mathrm{~cm} \)
Solution
Step 1 ：\(C = 15 \mathrm{~cm}\)
Step 2 ：\(C = \pi d\)
Step 3 ：\(d = \frac{15}{\pi} \approx 4.8 \mathrm{~cm}\)
