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= 1/2 x 22/7 x 11
= 121/7
K2 = 1/2 x π x d
= 1/2 x 22/7 x 4
= 44/7
K3 = 1/2 x π x d
= 1/2 x 22/7 x 7
= 77/7
K = K1+K2+K3
= 121/7 + 44/7 + 77/7
= 242/7
= 34.57