The hollow sphere, in which the circus motorcyclist performs his stunts,has a diameter of 7 m. Find the area available to the motorcyclist for riding.

The hollow sphere,in which the circus motorcyclist performs his stunts,has a diameter of 7m. Find the area available to the motorcyclist for riding.

The hollow sphere, in which the circus motor cyclist performs his stunts ,has a diameter of 7m. Find the area available to the motor cyclist for riding.

The hollow sphere, in which the circus motor cyclist performs his stunts, has a diameter of 7m. Find the area available to the motor cyclist for riding.

The hollow sphere, in which the circus motor cyelist performs his stunts ,has a diameter of 7m. Find the area available to the motor cyclist for riding.

The hollow sphere, in which the circus motor cyelist performs his stunts ,has a diameter of 7m. Find the area available to the motor cyclist for riding.

The length of a hollow right circular cylinder is 10 metres and the diameter of the base is 7 metres. Find the area of its curved surface.

There is a path of uniform width 7 m round and outside a circular garden of diameter 210 m. Find the area of the path.

You may have seen in a circus a motorcyclist driving in vertical loops inside a 'death- well' ( a hollow spherical chamber with holes, so the spectators can watch from outside). Explain clearly why the motorcyclist does not drop down when he is at the uppermost point, with no support from below. What is the minimum speed required at the uppermost position to perform a vertical loop if the radius of the chamber is 25 m?