Prectice set 3.3In figure 3.37, points G, D, E, Fre concyclic points o

1.	Prectice set 3.3In figure 3.37, points G, D, E, Fre concyclic points of a circle with1.centre CECF = 70°, mt(arc DGF) = 200。find m(are DE) and m(are DEF)Fig. 3.
Answer» sum of angles around the point should be 360° => m(arc DE) +70 + 200° = 360°=> m(arc DE ) = 360-200°-70°=> m(arc DE) = 90° so m(arc DEF) = 90°+70° = 160°

Prectice set 3.3In figure 3.37, points G, D, E, Fre concyclic points of a circle with1.centre CECF = 70°, mt(arc DGF) = 200。find m(are DE) and m(are DEF)Fig. 3.

Answer»

sum of angles around the point should be 360°

=> m(arc DE) +70 + 200° = 360°=> m(arc DE ) = 360-200°-70°=> m(arc DE) = 90°

so m(arc DEF) = 90°+70° = 160°