F.5 maths circle

Picture: http://postimg.org/image/c1luombi7/

In the figure, BD cuts AC and OC at E and G respectively. ㄥAOC =108° and
ㄥACD =98°. Use two methods to find ㄥEBC.

My method: http://postimg.org/image/47l9383pb/

Please suggest other method(s) to me, thank you!