circular pillar in a large circular room 2020 BMT Individual 19
Source:
January 6, 2022
geometrycirclesareas
Problem Statement
Alice is standing on the circumference of a large circular room of radius . There is a circular pillar in the center of the room of radius that blocks Alice’s view. The total area in the room Alice can see can be expressed in the form , where and are relatively prime positive integers and and are integers such that is square-free. Compute . (Note that the pillar is not included in the total area of the room.)
https://cdn.artofproblemsolving.com/attachments/5/1/26e8aa6d12d9dd85bd5b284b6176870c7d11b1.png