



 
6 inches!??? The International Tennis Federation states that the diameter of a tennis ball must be between 2.575 and 2.700 inches (which means between 6.541 and 6.858 cm). For your query, divide the diameter in half to get r (the radius). The volume of a SPHERE is $\large \frac43 \times \pi \times r^3;$ the volume of a CYLINDER is (area of base)$\times$(height); the area of a CIRCLE is $\pi \times r^2.$ Chris  


Math Central is supported by the University of Regina and The Pacific Institute for the Mathematical Sciences. 