2020 Math Kangaroo Levels 9-10 Problem #29

2020 Math Kangaroo Levels 9-10 Problem #29 29. A zig-zag line starts at the point A, at one end of the diameter AB of a circle. Each of the angles between the zig-zag line and the diameter AB is equal to 𝛼 as shown. After four peaks, the zig-zag line ends at the point B. What is the measure of angle 𝛼? (A) 60° (B) 72° (C) 75° (D) 80° (E) Another answer Thank you for watching and please subscribe if you would like to see more videos!