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A line segment has two endpoints.
A line segment has two endpoints
A chord is the part of a circle defined by two endpoints.
An angle has two endpoints and a single vertex.
To find the length of a side, you either measure it, or you calculate it. How you calculate it depends on what data is given. For example, if you have the coordinates of the endpoints of a line, you can calculate the length by using the Pythagorean theorem (or simply subtracting the coordinates of the two endpoints, if the line is perfectly vertical or perfectly horizontal).