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k = π d
k = 3,14 * 40
k = 125,6 cm
dengan diameter B = 45 cm
k = π d
k = 3,14 * 45
k = 141,3 cm
K=3,14 x 20 x 20
=62,8 x 20
=1256
DIAMETER B=45 CM
K=3,14 x 22,5 x 22,5
=70,65 x 22,5
=1589,625