Question

A,B and C are points on a circle, centre O; Angle AOB=40. Find the size of angle OAB

Answer 1

Answer:

angle OAB is 70

Step-by-step explanation:

OA=OB (radii of same circle)

OAB=OBA

OAB+OBA+AOB=180

2OAB=180-40

OAB=70

Answer 2

Answer:

angle oab= oba (because side are equal therefore opposite angle are also equal)

180 =40 +x+x

180-40=2x

140/2=x

70=x