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d = 88 . 7/22
d = 28
r = 14 cm
Luas = 22/7 . 14 .14
= 616 cm2
88= 2x 22/7x r
r = 14cm
L = πr^2 (r kuadrat)
= 22/7 x (14)^2
= 616 cm^2