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k.2 = 2 x 3,14 x 15 = 94,2
a. perbandingan k1 : k2 = 1 : 3
b. selisih = 62,8
= 31,4
phi x d = 3,14 x 30
= 94,2
B) 94,2 - 31,4 = 62,8