it has none
The moon is much bigger then Ceres. Ceres is just under 1000 km in diameter. The moon is about 3,474 km in diamter so that mean the moon is bigge by more then 3.4 times.
The Moon's diameter is approximately 3,474 kilometers (about 2,159 miles). This makes it about one-quarter the size of Earth, which has a diameter of roughly 12,742 kilometers (7,918 miles). The Moon is the fifth largest natural satellite in the solar system.
it is the circumfrance of a circle divided by pi.
6 in.
d = 2r
100.53 inches
1.4 million kilometers (870,000 miles).
diameter = 128/pi
The name of half a diameter is a radius.
circumference = pi*40cm
circumference = 15*pi cm
circumference = pi*diameter or pi = circumference/diameter