For social studies i know the answer is called a boundary
The out edge of a cup is called the 'Rim'.
It is called a side or edge.
Called a straight edge
An edge.
brim
For social studies i know the answer is called a boundary
cresent crescent
cresent crescent
That would be a cresent moon.
cresent crescent
That would be a cresent moon.
That would be a cresent moon.
That would be a cresent moon.
That would be a cresent moon.
The region of a country bordering on another or a line, barrier, etc., marking such a border is called a frontier. A frontier is also the edge of the settled area of a country.
A leaf's edge is called its margin.
The centre of a circle is simply called the cnetre. The edge may called the perimeter, the circumference or the edge.