The diagram shows 3 points, A, B and C, on a circle, centre O.
AC is a diameter of the circle.
B
Angle BAO is aº and angle BCO is yº
What is the size of angle ABC?

The diagram shows 3 points A B and C on a circle centre O AC is a diameter of the circle B Angle BAO is aº and angle BCO is yº What is the size of angle ABC class=