Area of Sectors


Related Topics:
More Lessons for Grade 9
Math Worksheets




Share this page to Google Classroom

Examples, solution, videos, worksheets, games and activities to help Geometry students learn how to find the area of sectors.

What is a sector?
A sector is part of a circle bound by the central angle and its intercepted arc. You can think of it as the area of a “slice of pizza”.

What is the formula for the area of sector?
The following diagram gives the formula for the area of sector. Scroll down the page for more examples and solutions.
Area of Sector
 

Area of a Sector
A sector in a circle is the region bound by two radii and the circle. Since it is a fractional part of the circle, the area of any sector is found by multiplying the area of the circle, π×r2, by the fraction x/360, where x is the measure of the central angle formed by the two radii.
This video shows two examples, one for finding the sector of a circle and the other to find the radius of a circle with a given sector area.




Finding the area of a sector of a circle

This video explains how to find the area of a sector.



Try out our new and fun Fraction Concoction Game.

Add and subtract fractions to make exciting fraction concoctions following a recipe. There are four levels of difficulty: Easy, medium, hard and insane. Practice the basics of fraction addition and subtraction or challenge yourself with the insane level.

Fraction Concoction Game



We welcome your feedback, comments and questions about this site or page. Please submit your feedback or enquiries via our Feedback page.