1) 108 ° has a mirror arc of the same length on the opposite side of the circle so 108 + 108 = 216 , then subtract that from all the way around the circle. so 360 - 216 = 144. Divide 144 by 2 equals 77 so arc EF = 77 °
2) are EFC is 360 - 60-70 = 230 °
3) it tough the angle is 74.. it was a lot to figure that out.. ask if you want to know
