# PARTS OF A CIRCLE

May 19th, 2015
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A circle is a locus with all the points on the plane at a constant distance from a fixed point (known as the centre).The parts of a circle:a) Centre - fixed point in the middle of the circle with a constant distance from all points on the circle.

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MATHEMATICS - FORM 2CIRCLESPARTS OF A CIRCLE(A) Identifying a circle as a set of points equidistant from a fixed pointA circle is a locus with all the points on the plane at a constant distance from a fixed point (known as the centre).(B) Identifying parts of a circleThe parts of a circle:(a) Centre - fixed point in the middle of the circle with a constant distance from all points on the circle.(b) Circumference - the length of the border of the circle.(c) Radius - the length of straight line from the centre to any point on the circumference.(d) Diameter- the length of a straight line joining any two points on the circumference passing through the centre. The length of the diameteris twice the radius.(e) Chord - a straight line joining any two points on the circumference. The diameter is the longest chord in a circle.(f) Arc - a part of the circumference of a circle with end-points on the circle. (g) Sector - the region bounded by an arc and two radii(h) Segment - the region bounded by a chord and an arc(i) Semicircle - one half of a circle formed within an arc and a diameter(j) Quadrant - one quarter of a circle formed by an arc and two perpendicular radii.(C) Identifying parts of a circleA circle or parts of a circle can be drawn using a straight edge, a pair of compasses or a protactor. D

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