Question

I need to find the measure of z and I have no idea how to find it, can someone help :/

http://i.imgur.com/AXN39zP.png

Answer 1

I know opposite angles are supplementary but I'm not sure how that will help me in this problem

Answer 2

well, 85 is half of the arc in front of it; and 90 of that is taken up already

and a full circle is 360 degrees to start with

Answer 3

supplementary would work too; the key is in the halfing property