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A solid in shape of a frustum is 21 cm high. Its radius of top is 10 cm and diameter of bottom is 30 cm. The volume of the solid is

A spherical iron ball of radius $$9$$ cm is melted and recast into three spherical balls. If the radii of two balls are $$1$$ cm and $$8$$ cm, find the radius of the third ball.

Given that the volume of a cone is $$\displaystyle 2355cm^{3}$$ and the area of its base is $$\displaystyle 314cm^{2}$$ Its height is

A metallic sphere of radius $$10.5 cm$$ is melted and then recast into small cones each of radius $$3.5 cm$$ and height $$3 cm$$. The number of such cones is

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The volume of a frustum cone top and bottom area of a circle and height is given. Choose the formula which satisfy the given statement ________________.($$A_1, A_2 , h$$ are area of top circle, area of bottom circle and height of frustum respectively).

Find the volume of the frustum cone whose base and top radius is 20 ft and 10 ft respectively. The height of the cone is 300 ft. (Use $$\pi$$ = 3). 

A cone of height $$7$$ cm. and base radius $$3$$ cm. is carved from a rectangular block of wood of dimensions $$10 cm. \times 5 cm. \times 2$$ cm. The percentage of wood wasted is

Find the volume of the frustum cone whose base and top radius is 11 in and 6 in respectively. The height of the cone is 36 in. (Use $$\pi$$ = 3.14). 

The base and top diameter of a cone is 1.2 mm and 0.5 mm respectively. The height of the cone is 24 mm. What is the volume of frustum of a cone? (Use $$\pi$$ = 3).

The volume of a frustum cone is 1,600 $$mm^3$$, whose base and upper area of a circle is 16 and 100 $$mm^2$$. Find the height of the cone.