Each circle comprises:

  1. radius, which is the distance from the center to any point on the circle;
  2. chord, which is a line joining two points on the circle;
  3. diameter, which is longest chord, the one goes through the center;
  4. circumference, which is the boundary of the circle. It is also the distance you would have to travel if you walked all the way around the circle;
  5. tangent, which is a line that touches the circle at only one point;
  6. sector, which is the region inside the circle between two radii;
  7. segment, which is the region between a chord and the circumference.

Related Term: pi

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