Skip to content / Đến nội dung
ThichHocToan.com

2023 AMC 10B Question 25

AMC10 · 2023 AMC 10B

Question 25

A regular pentagon with area $1 + \sqrt{5}$ is printed on paper and cut out. All five vertices are folded to the center of the pentagon, creating a smaller pentagon. What is the area of the new pentagon?
  1. $4 - \sqrt{5}$
  2. $\sqrt{5} - 1$
  3. $8 - 3\sqrt{5}$
  4. $\dfrac{\sqrt{5} + 1}{2}$
  5. $\dfrac{2 + \sqrt{5}}{3}$