10 Points for 1 Geometry Question!! First answer that's right gets the points!

what's the measure of angle ∠S?
http://i45.tinypic.com/2s80nye.gif

There is ∠S which is outside the circle.
The measure of angle S
is half the measure of larger angle*
minus the measure of smaller angle**
*Angle formed by larger arc AC at the centre O of the circle is 85 degrees
**Angle formed by smaller arc EN at the centre O of the circle is 25 degrees.
In math talk, we would say:
Angle S
= 1/2(Angle AOC - Angle EON)
= 1/2(85 - 25) degrees
= 30 degrees

= 1/2(85 - 25) = 30 degress

70 degrees.

I just learned this in geometry class. It's 30 degrees

idk