1. The problem statement, all variables and given/known data imgur.com/a/bsAKl [I didn't know how else to upload an image from my iPad] In this problem: -Center of the circle=Point F -Arc AB= 110 degrees -Arc CD= 40 degrees Find the measure of angle E. 2. Relevant equations I know of some equations, but I don't know if they apply to this particular problem. 3. The attempt at a solution I tried for about 10 minutes, but I didn't know where to begin. I was absent on the day this was taught (I think) and I don't feel like searching for this in the eBook. Anyways, so far I know: -Arc AB + Arc CD + something = 360 degrees Other than that, I really don't know what else I can do with this info. *I know the answer to this is 40 degrees because it was posted later, but I don't know how that is the answer. My friend said that whenever he sees a triangle, he does the Triangle Angle Sum Theorem. He said he did 180 degrees - (110 degrees + 40 degrees) to get 40 degrees. *I know that's incorrect because: (A) That "shape" is not a triangle because AB and CD are arcs, not straight lines. (B) The measurements are for the arcs, not the angles of the supposed "triangle". Arc =/= Angle. BUT he still got it correct. A bunch of other people did that wrong method but got the correct answer as well, while I left it blank. Please help guys because this is gonna be on the state final as well.