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Objętość kuli: V=4/3 π R³
154 = 22/7 * R² / * 7/22
49 = R²
R = 7
V = 4/3 π * 7³ = 1372/3 π = 1372/3 * 22/7 = 30184/21 = 4312/3
Objętość kuli wynosi 4312/3 cm³.
π=22/7
P = 154cm²
V=?
r²=P/π
r²=154÷22/7=49
r=7cm
V=4/3πr³
V=4/3×22/7×7³=88/3×7²=1437⅓ cm³