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Dit : K?
Dij : r = d/2 = 15/2 = 7,5
K = 2 × π × r = 2 ×3,14 ×7,5 = 47,1 cm
r = 1/2 D
r = 1/2 x 15 = 7.5
phi = 3,14 atau 22/7 ( ketentuan)
keliling lingkaran = 2 phi r
=2x3,14x7,5 = 47,1