The endpoint has no dimension. It has no endpoint.
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It has two endpoints. A ray has one endpoint.
diameter
An angle is the union of two rays with a common endpoint.
Not necessarily - it depends on the geometry. The equator, on a sphere like the earth, is a straight line on a spherical surface. It has no endpoint.
Add the same amount again by finding the difference of the midpoint and end point. Example: If the end point is 3 and the mid point is 9. The difference between 3 and 9 is 6 so add 6 to 9 and get 15.