the two sides on the moon are highland and the mare. the mare
are lower in altitude than the highlands . but there is no water on
the moon so they are not literally seas .
View page
The moon is spherical. Therefore it has no sides silly.
View page
It could be an angle with either two sides or two rays. If it's
a closed object then it might be like the letter D. Or like a
crescent (quarter moon).