6. The formula for the volume of a cone is V=1/3 tr^2 h. (Please note: The

formula is read as, "Volume equals one-third pi radius squared times

height"). The radius, r, of the cone may be expressed as *

O 1. 3V(V/rth)

O 2. 1/3 (V/th)

O 3. V(V/3rth)

O 4. V(3V/rth)