14). (Take π value as 22/7) circumference = 66in 2πr = 66in 2×22/7×r = 66 r = 66×7/2×22 r = 21/2in d = 2r => d = 2×21/2 therefore diameter of the circle = 21in
15). (Take π value as 3.14) Circumference = 3.14m 2πr = 3.14m 2×3.14×r = 3.14 r = 3.14/3.14×2 r = 1/2m Therefore the radius of the circle = 0.5m
16). (Take π value as 22/7) Circumference = 33km 2πr = 33km 2×22/7×r = 33 r = 33×7/2×22 r = 21/4 d = 2r d = 2×21/4 d = 21/2km Therefore the diameter of the circle = 10.5km
