1. the Center is the point at which the middle and away from the circumference by at all (in the center of a circle is just a single point)2. RADIUS (r) is the Division of a straight line drawn from the Center to the circumference RADIUS for each line the same length (in the circle will have a radius of countless variety)3. diameter of the Center is part of a straight line drawn from the circumference one side. Through the Center to the circumference on the other side (lines through the center of the double long RADIUS.4. the record is part of a straight line drawn from one side to the circumference circumference on the other side, where the two endpoints are on the same circle (a circle in any record, the longest is the diameter of the circle's center point.5. the sector is part of a circle of circumference and radius of two lines is a triangle base curve.6. the segment is part of a circle that originates from records and the circumference.7. arc is a portion of the circumference.
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