names of different parts of a circle
Lines. A line that goes from one point to another on the circle's circumference is called a Chord. If that line passes through the center it is called a Diameter. A line that just touches the circle as it passes by is called a Tangent. And a part of the circumference is called an Arc.ecause people have studied circles for thousands of years special names have come about. Nobody wants to say that line that starts at one side of the circle, goes through the center and ends on the other side when a word like Diameter will do.