In the diagram, is a side of regular hexagon abcdef inscribed in circle o. what is m?

In the diagram,a  side of regular hexagon abcdef inscribed in circle o. what is m∠fda? a.60° b.40° c.30° d.20°note: -regular polygons have all angle equal- angle in a semicircle is always  a right anglesoad is diameter so it will divide angle a in two  equal part so 60 and 60  90+60+fda=180 fda=180-150=30so the answer is c. 30 degrees.