The topic/ search query is "intercepted arcs" The outermost angel is your far arc (135°) The closer of the two on the circle is your near arc (missing variable "x") The angle provided is your reference angle (39°<span>) </span>The formula used to solve is far arc - near arc <span>÷ 2 = reference angle </span> So...algebra wise you'll want to reverse this equation in order to get your missing angle. Like so. 39 <span>x 2 = 78, 135 - x = 78 once again, "x" is your variable / near arc
Therefore your answer for the missing degree is 57</span>°