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Area of a Circle Segment Given the Central Angle
Definition: The number of square units it takes to fill a
segment of a circle
Try this Drag one of the orange dots that define the endpoints of the segment.
Note the number of square units it takes to fill it.
The formula to find the area of the segment is given below. It can also be found by calculating the area of the whole pie-shaped sector and subtracting the area of the isosceles triangle △ACB. Where:
If you know the segment heightIf you know the segment height and radius of the circle you can also find the segment area. See Area of a Circular Segment given the Segment Height. CalculatorUse the calculator below to calculate the segment area given the radius and segment's central angle, using the formula described above 
Remember: In this version, the central angle must be in degrees. 
While you are here..
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Equations of a circle
Angles in a circleArcs
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