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luas = v ÷t
= 21560 cm^3 ÷35 cm
= 616 cm^2
luas = phi x jari jari x jari jari
jari jari = akar (616÷phi)
= akar (616 ÷ 22/7)
= akar 196
jari jari = 14cm
21560 = 22/ 7 x r² x 35
r² = 21560 x 7 : 22 x 35
r² = 150920 : 770
r² = 196
r = √ 196 = 14 cm