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2(22/7)r=132
r=21
d = 2r
= 2 x21
=42
maka :
K = 2 x π x r
132 = 2 x 22/7 x r
132 = 44/7 x r
r = 21
jadi jari-jari = 21 cm
maka diamter = r x 2 = 21 x 2 = 42 cm