draw a slump cone . now imagine what the shape would be if u extend the sides of the slump cone. you'll have a complete cone with the base of 20 cm and the hight of 60 cm. all you need to do is to subtract the big cone form the top small cone.
V=1/3(3.14*0.22*0.6) - 1/3(3.14*0.12*0.3)
V= 0.02198 m3
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The volume of this cone is 148.44025 cubic feet.
The volume of this cone is 37,699 cm3
finding the volume of a cone
Volume of a cone = 1/3*pi*radius2*height
The simple is to calculate the volume of the cone and subtract from the result the volume of the cone whose altitude is 1/2 the altitude of the original cone. This is easier said than done. The volume of a cone with circular base is (1/3)πr2s where r is the radius of the base and s is the altitude. The radius of the base of the empty part of the cone and hence its area can be found by using the pythagorean theorem