Surface Areas a...

Find the volume of a hemisphere of radius $$7\;dm$$.

Diameter of a football is $$28\;cm$$. It is made up of small hexagones each of area $$112\;cm^2$$. Find the number of small hexagones used in football.

Diameter of a sphere is $$21$$ dm. Find its surface area.

Which one of the following statement is INCORRECT?

A hemispherical tank has inner radius of $$1.05\;m$$. Find its capacity in litres.

The area of the curved surface of a sphere is $$5544\;m^2$$. Find the radius of the sphere.

Find the surface area of the following cubes with length of edge
$$4\;cm$$
$$3.2\;cm$$

The sum of the radius of the base and the height of a solid cylinder is $$37 m$$. If the total surface area of the cylinder be $$1628 sq. m$$, then its volume is: 

The volume of a hemispherical ball is given by the $$\displaystyle V=\frac{2}{3}\pi r^{3}$$ where $$V$$ is the volume and $$r$$ is the radius Find the diameter of he hemisphere whose volume is $$\displaystyle \frac{468512}{21}m^{3}$$

Find the area covered by a road roller of width $$80\;cm$$ and diameter $$140\;cm$$ in $$40$$ revolutions.