Area of an Annulus - Concept

Concept Concept (1)

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. Related topics include area of a sector, area of a circle and area of an segment.

Sample Sample Problems (3)

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Area of an Annulus - Problem 1
Problem 1
How to calculate the area between two circles, given the radius of the smaller circle and the distance between the circles.
Area of an Annulus - Problem 2
Problem 2
How to calculate the area between two circles, given the radius of the smaller circle and the distance between the circles.
Area of an Annulus - Problem 3
Problem 3
How to find the distance between two circles given the area of the annulus and the radius of the smaller circle.