3.14r^2h=3.14(a/2)^2a=3.14*a^3/4=1296

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3.14*r^2*h=3.14*(a/2)^2*a=3.14*a^3/4=12963.14*r^2*h=3.14*(a/2)^2*a=3.14*a^3/4=12963.14*r^2*h=3.14*(a

3.14*r^2*h=3.14*(a/2)^2*a=3.14*a^3/4=1296
3.14*r^2*h=3.14*(a/2)^2*a=3.14*a^3/4=1296

3.14*r^2*h=3.14*(a/2)^2*a=3.14*a^3/4=1296
乘方
r^2=r²