Area of a circle is ,

where or

is the radius of the circle.

is the ratio of the circumference of a circle to its diameter.

The perimeter of a circle is the distance covered by going around its boundary once. The perimeter of a circle has a special name: Circumference, which is times the diameter which is given by the formula

A circular segment is a region of a circle which is “cut off” from the rest of the circle by a secant or a chord.

The angle of a sector is that angle which is enclosed between the two radii of the sector.

The length of the arc of a sector can be found by using the expression for the circumference of a circle and the angle of the sector, using the following formula:

Where is the angle of sector and is the radius of the circle.

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