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= 3,14 x 10
= 31,4
Keliling b = Phi x D
= 3,14 x 30
= 94,2
31,4: 94,2 = 1 banding 3
Semoga Bermanfaat :-)
phi x 5 x 2 : phi x 15 x 2
phi.10 : phi.30
10 : 30
1 : 3