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22/7.r².36=88704cm²
r²=88704x7:22:36
r²=784 r=√784⇒28cm
b.π2rt=22/7.2.28.36
=22.2.4.36=6.336cm²
5.4/3πr³:πr²t
4/3r=t
4/3.3,5 : 7
4/3:2⇒2:3