A cone with a base radius of 12 cm and a height of 18 cm has a volume of 2,714.34 cm3
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Volume = pi*r2*h = 40715.04 cubic cm
SA = 904.78 cm2
radius = 18/2 = 9 cm
19.5cm, the value halfway between the two middle values.
area=basexheight=18x5=90