A circle is the set of the points which are in equal distance(radius) to a given point(centre). Calculate its diameter, circumference and area.

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A circle is the set of the points which are in equal distance(radius) to a given point(centre). Calculate its diameter, circumference and area.

`Circle Formula`

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A circle is the set of the points which are in equal distance(radius) to a given point(centre). Calculate its diameter, circumference and area.

$r$, Symbol for Radius;

$\pi $, Symbol for Pi;

$d$, Symbol for Diameter;

$C$, Symbol for Circumference;

$A$, Symbol for Area;

Circle, geometrical curve, one of the conic sections, consisting of the set of all points the same distance (the radius) from a given point (the centre). A line connecting any two points on a circle is called a chord, and a chord passing through the centre is called a diameter. The distance around a circle (the circumference) equals the length of a diameter multiplied by π (see pi). The area of a circle is the square of the radius multiplied by π. An arc consists of any part of a circle encompassed by an angle with its vertex at the centre (central angle). Its length is in the same proportion to the circumference as the central angle is to a full revolution.

$d=2r$

$C=2\mathrm{\pi r}$

$\mathrm{A}={\mathrm{\pi r}}^{2}$

^{Figure - 13.1} https://www.brighthubeducation.com/homework-math-help/101920-how-to-find-the-diameter-of-a-circle/