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= 60/360 × 2 × 3,14 × 12,7
= 1/6 × 79,756
= 13,29 cm
B. K = 2πr
= 2 × 3,14 × 12,7
= 79,756
C. d = 2 × r = 2 × 12,7 = 25,4 cm
D. r = 12,7