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 a as shown. After four peaks, the zig-zag line ends at
the point B. What is the size of angle a?
A 60°
B
72
С C
75°
D
80°
E
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