ABCDEFGH is a cube. What is the length of the line segment AG? I. The length of the line segment AB is 4 inches. II. The area...

Answer: 
if either statement (I) alone or statement (II) alone sufficient.
ABCDEFGH is a cube. What is the length of the line segment AG? I. The length of the line segment AB is 4 inches. II. The area of the square BCGH is 16 square inches.