Question

A cylindrical water tank has a diameter of 9 ft and a height of 12 ft. The water surface is 2 ft from the top. About how much water is in the tank? 2,798 ft3
636 ft3
2,543 ft3
509 ft3

Answer 1

V = $\pi r^{2} h$

 = 3.142 × 4.5 × 4.5 × 10

 = 636.255 ft^3

Note: 10 is because water is 2 ft below from the top and the whole cylinder is 12, so 12-2 = 10.

Therefore 636 ft^3 water is in the cylinder.