Circle
It is a locus of points drawn at a definite distance from a fixed point.
Arc : A part of circumference of a circle.
Chord : A line segment within a circle touching two points on it.
Circumference : Perimeter of a circle = 2*pi*r.
Value of pi : 3.14 or 22/7
Area of a circle : pi*r*r
Length of a arc : 2*pi*r* x/360
Area of a sector : pi*r*r*x/360
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