keliling = pi x d
=22 per 7 x 42 (7 di coret diganti 1 42 dicoret ganti 6)
22 x 6 = 132
luas= pi x r x r r =jari
= 3,14 x 21x 21
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keliling = pi x d
=22 per 7 x 42 (7 di coret diganti 1 42 dicoret ganti 6)
22 x 6 = 132
luas= pi x r x r r =jari
= 3,14 x 21x 21