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K = 2 . phi. r
= 2 . 22/7 . 4,2 ==》 26,4 cm
untuk diameter 35
K = phi . d
= 22/7 x 35 ==》110 cm
r=4,2cm
kll=2×22/7×4,2=26,4cm
kll2=22/7×35=110cm