In circle math the terms related to the circle are discussed here.
A circle is such a closed curve whose every point is equidistant from a fixed point called its center.
The symbol of circle is O.
What are the terms related to the circle?
The terms related to the circle math are:
(i) Center:
The center of a circle is a fixed point within the circle from which all the points of the closing curve are equidistant.
O is the centre.
(ii) Circumference:
The curve which closes a circle is called its circumference. The length of the circumference is called the length of the circle.
(iii) Radius:
The distance from the centre to any point on the circumference of a circle is called the radius of the circle. The symbol of the radius is r.
(iv) Diameter:
The linesegment
passing through the centre and meeting the points on the circumference
is called the diameter of the circle. Diameter is denoted by 'D'.
AB is a diameter of the circle.
Diameter is twice the length of the radius concerned.
Thus, D = 2r [Diameter = 2radius]
or
r = D/2 [Radius = Diameter/2]
(v) Arc:
Any part of the circumference is called an arc of the circle.
(vi) Chord:
The linesegment joining the two ends of an arc is known as a chord. A diameter is the longest chord of a circle.
Here,
O is the centre.
OP is one radius.
AB is a diameter.
MN is a chord . (linesegment)
OA and OB are also radii.
Related Concepts on Geometry  Simple Shapes & Circle
● Polygon
● Angle
● Triangle
4th Grade Math Activities
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