Question

Volume bola yang luasnya 154 cm2 adalah...

Answer 1

Luas permukaan = 4πr²
154 = 4 x 22/7 x r²
r² = 49/4
r = 7/2
V = 4/3 x 22/7 x 7/2 x 7/2 x 7/2
= 179,67 cm³

Answer 2

Lbola=4×π×r²
154=4×22/7×r²
154×7=4×22×r²
1078=88r²
r²=1078/88
r²=12,25
r=√12,25
r=3,5cm

Vbola=4/3×π×r³
       =4/3×22/7×3,5³
      =179,67