Question 18A right circular cone of volume $A,$ a right circular cylinder of volume $M,$ and a sphere of volume $C$ all have the same radius, and the common height of the cone and the cylinder is equal to the diameter of the sphere. Then$A-M+C=0$$A+M=C$$2A=M+C$$A^2-M^2+C^2=0$$2A+2M=3C$