Question

In a throw ball game, Ben, Ted, Mike and John are positioned at different points, as shown below.

Three concentric circles are drawn with the 4 quadrants. Ben and Ted are shown as points standing in two adjacent quadrants on the line of the outermost circle. Mike and John are shown as points standing in two remaining adjacent quadrants on the line of the middle circle. Four segments are drawn, each joining the center to the four players. A segment joins Ben and Mike in the opposite quadrants, the included angle between the radii of the triangle formed between Ben and Mike is 140°. Another s