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132cm= 22/7.d
d = 132x7/22
d = 42cm, r=21
luas = π.r² =
= 22/7.21.21 =
= 1386cm²
ditanya : L ?
jawab ;
K =
132=2 . (22/7) . r
r=(132 . 7) / (2 . 22)
r= 924/44
r=21
L=
= (22/7). 21.21
=1386