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Parts of a circle circumference The boundary line or perimeter of a circle. centre The point inside the circle which is the same distance from all points on the circumference. radius The distance from the middle of the circle to the circumference of the circle. diameter The distance across a circle through the centre (twice the radius). chord A line segment that joins two points on the circumference, but not passing through the centre. circumference centre radius diameter chord For more homework help, tips and info sheets go to www.schoolatoz.com.au © Owned by State of NSW through the Department of Education and Communities 2011. This work may be freely reproduced and distributed for non-commercial educational purposes only. Permission must be received from the department for all other uses. 1/2 segment The part of a circle that is between a chord and the circumference. segment arc The part of the circumference between 2 radii (plural of radius). arc chord quadrant quadrant Quarter of a circle or a quarter of its circumference. sector The part of a circle between 2 radii. sector semicircle Half of a full circle. For more homework help, tips and info sheets go to www.schoolatoz.com.au © Owned by State of NSW through the Department of Education and Communities 2011. This work may be freely reproduced and distributed for non-commercial educational purposes only. Permission must be received from the department for all other uses. 2/2