ananekusuma21
V bola = 38.808 4/3 x phi x r^3 = 38.808 4/3 x 22/7 x r^3 = 38.808 88/21 x r^3 = 38.808 r^3 = 38.808 : 88/21 r^3 = 38.808 x 21/88 r^3 = 9.261 r = akar pangkat tiga dr 9.261 r = 21 cm maka, Ls bola = 4 x phi x r² = 4 x 22/7 x 21 x 21 = 4 x 22 x 3 x 21 = 5.544 cm²
4/3 x phi x r^3 = 38.808
4/3 x 22/7 x r^3 = 38.808
88/21 x r^3 = 38.808
r^3 = 38.808 : 88/21
r^3 = 38.808 x 21/88
r^3 = 9.261
r = akar pangkat tiga dr 9.261
r = 21 cm
maka,
Ls bola
= 4 x phi x r²
= 4 x 22/7 x 21 x 21
= 4 x 22 x 3 x 21
= 5.544 cm²