Skip to content / Đến nội dung
ThichHocToan.com

2015 AMC 12B Question 16

AMC12 · 2015 AMC 12B

Question 16

A regular hexagon with sides of length $6$ has an isosceles triangle attached to each side. Each of these triangles has two sides of length $8.$ The isosceles triangles are folded to make a pyramid with the hexagon as the base of the pyramid. What is the volume of the pyramid?
  1. $18$
  2. $162$
  3. $36\sqrt{21}$
  4. $18\sqrt{138}$
  5. $54\sqrt{21}$