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K = 60/360 × phi × 2 × r
K = 1/6 × 2 × 3,14 × 12
K = 3,14 × 4
K = 12,56 cm
K lingkaran besar
K = 60/360 × 2 × phi × r
K = 1/6 × 2 × 3,14 × 21
K = 3,14 × 7
K = 21,98 cm
total K
K = 12,56 + 21,98 + 9 + 9
K = 52,54 cm