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88 =22/7d
d =28
r=14
L lgkran= pi.r kuadrat
=22/7.14.14
=616
diameter = k:Π = 88 : 22/7 = 28 m
jari-jari = d / 2 = 28/2 = 14 m
b. luas
luas = Π x r² = 22/7 x 14 x 14 = 616 m²