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=47,1
b.keliling = 22\7 x 20 cm
=62,8
jika di ketahui diameter
k = phi x d
jika di ketahui jari-jari
k = 2 x phi x r
jawaban
1.) keliling = phi x d
= 3,14 x 15
= 47,1 cm
2.) keliling = phi x d
= 3,14 x 20
= 62,8 cm