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a. K = 2 × pi × r = 2 × 3,14 × 12 m = 24 × 3,14 = 75,36 m
b. K = 2 × pi × r = 2 × 3,14 × 4,2 cm = 8,4 × 3,14 = 26,376 cm
a. )
r = 12 cm
Kel. O = 2 × 3,14 × 12
= 75,36 cm
b.)
r = 4,2 cm
Kel. O = 2 × 3,14 × 4,2
= 26,376 cm