In circle O, and are diameters. The measure of arc DC is 50°. Circle O is shown. Line segments A C and E B are diameters. Line segment O D is a radii. Point D is between points E and C. Angle B O D is 90 degrees. What is the measure of Arc E B C? 40° 90° 140° 220°

The answer is 220!

Explanation:

So, you add up the arc measures which I think are the same as the angle measures that form the arc.  The question asks to go from E to B to C.  From E to D it's 90 degrees then from D to B it's 90 degrees then from B to C it's 40 degrees.  Add up these values (90+90+40) and that equals 220 degrees.

(I just got it right on Edge)