The formula for the volume of a cylinder is
... V = π·r²·h
where r is the radius and h is the height.
Filling in the given numbers, we have
... 225π in³ = π·(10 in)²·h
Dividing by the coefficient of h, we get
... (225π in³)/(100π in²) = h
Cancelling common factors, gives
... 2.25 in = h
The appropriate choice is
... A) 2.25 inches