O is the centre of the circle and ABC and EDC are tangents to the circle. Find the size of angle BCD. You must give reasons in your answer.

*I got 3/4 Marks, can someone help me achieve the 4th?*

It may have something to do with reasoning...

O is the centre of the circle and ABC and EDC are tangents to the circle Find the size of angle BCD You must give reasons in your answerI got 34 Marks can someo class=