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O= 2piR
2piR=18pi /2pi
R=9
Pp=4pi R²=4*π*9²=324π cm²
V=4/3 pi r³=4/3π*9³= 972 pi cm³
2) V1= 4/3 pi r³ = 4/3 pi 27= 36 pi
V2= 4/3 * pi * 216= 288pi
V=V1+v2=36pi+288pi=324pi
4/3pi r³=324pi /:4/3 pi
r³=243
r=∛243=∛27*9=3∛9