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r= 15 cm
v=??
tinggi(phytagoras)=> ((30) ^2)-((15)^2)= 25.98 cm
Volume=1/3 pi x r^2 x t
=1/3 x 225 x 25.98 x 3.14
= (225/3) x 81.326
= 75 x 81.326
= 6.118,29 cm^3