Question

what fraction of a semicircle is an angle that measures 11pi/18 radians? express your answer as a fraction in simplest terms

Answer 1

Check the picture below.

let's recall that, the arc made from 0 to π is just half a circle or namely a semi-circle, so any fraction of π refers to that arc

`\cfrac{11\pi }{18}\qquad \textit{really means}\qquad \cfrac{11}{18}\qquad \textit{of that semi-circle}`