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Area of Segments and Annulus

Videos, worksheets, games and acivities to help Geometry students learn how to find the area of segments and annulus.

Area of a Segment
The area of a segment in a circle is found by first calculating the area of the sector formed by the two radii and then subtracting the area of the triangle formed by the two radii and chord (or secant). In segment problems, the most challenging aspect is often calculating the area of the triangle.

Area Of Sector And Segment Examples

Annulus Area
An annulus is similar to a ring or a castle's moat; it is the area between two concentric circles. Calculating the annulus area, therefore, involves finding the difference of the two circles' area. A common trick on annulus problems is to give the distance between the small and large circle, and not the large circle's radius.

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