A hollow sphere in which a circus mororcyclist performs his stunts as a in a diameter of 7m. Find the area available to the motorcyclists for riding
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Inner diameter of hollow sphere =2r =7m , r =7/2.
Available areato motorcyclist for riding
=Inner surface area of sphere.
=4 ×22/7 ×r^2.
=4 ×22/7 × 7/2 ×7/2
=2 ×11 × 7
=154 m^2.
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