# Area of Annulus by Rearrangement

- Author:
- Eugene Yablonski

- Topic:
- Area, Geometry, Integral Calculus

To Geometry students: If you were to approximate each sector with a parallelogram, what would be the dimensions and area of such parallelogram?
To Calculus students: Make n large. If you were to estimate the total area by approximating every thin sector with a rectangle (like in Riemann sums) what would be the width of such rectangle?