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πr² = 38,5
22/7 x r² = 38,5
r² = 12,25
r= 3,5 cm.
V bola= 4/3 πr³
= 4/3 x 22/7 x 3,5 x 3,5 x 3,5
= 179,67 cm³
154 = 4 × 22/7 × r²
154 = 88/7 × r²
r² = 154×7/88
r² = 1,75 × 7
r² = 12,25
r = 3,5
V = 4/3 × 22/7 × 3,5 ×3,5 × 3,5
= 179,67