Mathematics for IGCSE & O level - Mensuration (Section 13 - No. 22)
A circle has a circumference of 31.4 cm. What is its approximate diameter? (Use π ≈ 3.14)
5 cm
10 cm
15 cm
20 cm
คำอธิบาย
Circumference = πd, so d = Circumference / π = 31.4 cm / 3.14 ≈ 10 cm.