Areas Related to Circles – Notes

Areas of Sector and Segment of Circle

Circumference of a circle of radius r is 2pr

Area of circle is pr².

Length of the arc of a sector of a angle  is   2pr

Area of a sector of angle is   pr²

Area of a segment is the area of corresponding sector minus the area of the corresponding triangle.

Areas of combinations of plane figures

A collection of points that are on a plane is known as plane figure.