Draw a line from K to M. If you draw any angle whose vertex is on the upper side of KM, you get two angles that add to 180o. One of the angles is 104x + 1.
But ...
What do you do about the arc? It is 211o - 1? That value = the central angle. A central angle is the angle going from K to the center of the circle to M. 1/2 that amount is the angle going to anywhere on the arc of the circle. So that is 1/2 of 211 - 1 = 105.5x - 1/2
These two angles when added together = 180o
105.5x - 1/2 + 104x + 1 = 180o Collect like terms on the left 209.5x + 1/2 = 180 Subtract 1/2 from both sides 209.5x = 180 - 1/2 209.5x = 179.5 Divide by 209.5 x = 179.5 / 209.5 x = 0.8568
