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= 1/3.phi.r².16
= 16.1/3.phi.r²
Vb = 4/3 phi.r³
= 4.1/3.phi.r².r
= 4.1/3.phi.r².12
= 48.1/3.phi .r²
Vb : Vk
48.1/3.phi .r² : 16.1/3.phi.r²
48 : 16 = 3 : 1
jd perbaningan 3 : 1