The arc is 4 right,
And the whole circle has a perimeter of 20.
If you do 20/4, you get a total of 5 of those pink arcs that fit in the circle.
A circle has 360 degrees, so if you do 360/5 = 72 and That’s your answer. I hope you understand my logic, if you don’t I can clear some things up....?
ANSWER:
72 degrees