KillerSquirrel says :

All you need to know is that the arc degree faceing x is 2x (the whole circle is 360 degrees round) , that way if you solve for x=30 then 2x = 60 and since the perimeter of the circale is 2*pi*5 = 10*pi, and you need (60+60)/360 = 1/3 of that perimeter. Then the arc is 10/3*pi.

Alimad : Asking a dumb question, is this a a hard and fast rule that the arc's degree would be twice its opposite angle?

KillerSquirrel says :

Did you understood the values for the sides (i.e. 10*sqrt(3) ?

Alimad : Sort of, I thought when you draw a straight line from C to A, BAC is the right angle instead of BCA, or don't you think we should draw a straight line from C to E, that would make BAC and BAE right angles ? Thanks for all you help

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