Ok G+....I need some help here...A sphere has a diameter of 2,160 meters. How many meters long is “Unit X” if the surface of the sphere, measured in square Units X is equal to the volume of the sphere measured in cube Units X? Round to the nearest whole number, and enter the number only...what I came up with is....If you set surface area equal to volume, you have 4 π r^2 = 4/3 π r^3, so r = 3 units. Thus, 3 units is the radius, which half the diameter. If 3 units = 1080 meters, then 1 unit = 360 meters. Can anyone back that up?