Skip to content / Đến nội dung
ThichHocToan.com

2022 AMC 12B Question 21

AMC12 · 2022 AMC 12B

Question 21

Let $S$ be the set of circles in the coordinate plane that are tangent to each of the three circles with equations $x^2 + y^2 = 4,$ $x^2 + y^2 = 64,$ and $(x - 5)^2 + y^2 = 3.$ What is the sum of the areas of all circles in $S?$
  1. $48\pi$
  2. $68\pi$
  3. $96\pi$
  4. $102\pi$
  5. $136\pi$