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k = π x d
220 = 22/7 x d
d = 220 x 7/22
d = 70
r = 70 : 2 = 35
l = π x r x r
l = 22/7 x 35 x 35
l = 3850 cm² (A)
2. 360° : 45° = 8
jadi 45° adalah 1/8 lingkaran
luas =
1/8 x π x r x r
1/8 x 22/7 x 28 x 28
308cm² (D)