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113,4 =4/3 (3,14) r3
r3 = 113,4/4,19
r = akar 3 dari 27,04
r = 3,0014
b. Lbola = 4 phi r2
= 4 (3,14) (3,0014)^2
= (12,56) (9,0084)
= 113,146