Answer:
 3.5 in
Step-by-step explanation:
Put the given numbers in the formula for the volume of a cylinder, then solve for the unknown.
 V = πr²h
 73.5π = πr²·6 . . . . . fill in V and h
 12.25 = r² . . . . . . . . divide by the coefficient of r²
 3.5 = r . . . . . . . . . . . take the square root
The radius of the can is 3.5 inches.