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A line segment ends, because it is a line with two dots on the end to stop it. It is just a regular line that does not end. There could also be a ray, which is a line with only one side stopped with a point and the other going on forever. you said it ends and then you said it doesn't end
A diameter of a circle must pass through the center of that circle. A cord is a line segment that has its endpoints on the circumference of a circle. It can be any line segment. If that cord also passes through the center of the circle, it is said to be a diameter of that circle. A diameter of a circle is the longest cord of the circle.
They are said to be perpendicular to each other
A symmetrical shape is said to have line symmetry. A shape that has line symmetry can have one or more lines of symmetry
An object is said to be in uniform motion if it moves in a straight line at constant speed.