Di ketahui luas permukaan bola 2.464 cm.phi =22/7. Tentukan jari jari bola!

BOLA

L = 2.464
4 × phi × r^2 = 2.464
4 × 22/7 × r^2 = 2.464
88/7 × r^2 = 2.464
r^2 = 2.464 × 7/88
r^2 = 28 × 7
r^2 = 196
r = akar196
r = 14 cm

jari jari bolanya 14 cm

L = 4.π.r²
2.464 = 4 × 22/7 × r²
2.464 = 88/7 × r²
r² = 2.464 × 7/88
r² = 28 × 7
r² = 196
r = √196
r = 14 cm ✔