t= akar dari 20^2- 12^2=16
v=1/3×3.14×12×12×16=2411,52
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t= akar dari 20^2- 12^2=16
v=1/3×3.14×12×12×16=2411,52
=√400-144
=√256
=16 cm
v=1/3.La.t
=1/3.3,14.12.12.16
=2411.25 cm²