Problem

2023 AMC 10A Problem 15

An even number of circles are nested, starting with a radius of 1 and increasing by 1 each time, all sharing a common point. The region between every other circle is shaded, starting with the region inside the circle of radius 2 but outside the circle of radius 1. An example showing 8 circles is displayed below. What is the least number of circles needed to make the total shaded area at least 2023\pi?

Problem 15 diagram

\textbf{(A)} 46 \qquad \textbf{(B)} 48 \qquad \textbf{(C)} 56 \qquad \textbf{(D)} 60 \qquad \textbf{(E)} 64


Full credit goes to MAA for authoring these problems. These problems were taken on the AOPS website.


Show/Hide Problem Tags

Problem Tags: 2-d Geometry

Want to contribute problems and receive full credit? Click here to add your problem!
Please report any issues to us in our Discord server
Go to previous contest problem (SHIFT + Left Arrow) Go to next contest problem (SHIFT + Right Arrow)