What is the volume of a hemisphere with a diameter of 6 feet to the nearest hundredth of a cubic foot?

A hemisphere is 1/2 the volume of  a sphere

volume of  a sphere is 4/3pir^3

so 1/2 of that would be 2/3pir^3

d/2=r
6/2=r=3

v=2/3pi3^3
v=2/3pi27
v=2pi9
v=18pi
aprox
v=56.548667764616278292327580899031 cubic feet
round
v=56.55 cubic feet

It is based on the reddish glow of the morning or evening sky, caused by haze or clouds related to storms in the region.