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
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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.
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© 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.
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