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V=4/3πr³
972π=4/3πr³obóstronnie podziel przez π
972=4/3r³/÷4/3
972×3/4=r³
729=r³/∛
r=9
P=4πr²
P=4π9²
P=4π81
P=324πcm²
324πcm²-100%
x-20%
x=324×20÷100
x=64,8
P=324+64,8=388,8πcm²≈389πcm²
P≈389×3,14≈1221,46cm²≈1221,5≈1222cm²