Mathematics for IGCSE & O level - Mensuration (Section 9 - No. 16)
A farmer wants to build a fence around a circular field. If the radius of the field is 14 meters, approximately how much fencing does he need? (Use π ≈ 22/7)
44 meters
88 meters
176 meters
616 meters
解释
Circumference = 2 * π * r = 2 * (22/7) * 14 = 88 m. He needs fencing for the circumference.