Referring to the figure, segment AB and segment NM are diameters of circle E. Find the angle of arc MCB

Given the circle E:
We know that if AB is a diameter, then ACB is 180°. Now, the angle of arc MCB is the sum of the angles ACB and MA:
[tex]\measuredangle\text{MCB }=55\degree+180\degree=235\degree[/tex]