C=2ПR, R=a/V3=16/V3, C=2П*16/V3=32П/V3 r=a/2V3=16/2V3=8/V3,
S кр=Пr^2=П*64/3(cм^2)
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C=2ПR, R=a/V3=16/V3, C=2П*16/V3=32П/V3 r=a/2V3=16/2V3=8/V3,
S кр=Пr^2=П*64/3(cм^2)