Well for the first figure, the angles m<1 and m<3 are equal and angles m<2 is equal to 112 degrees. One way to solve this is knowing that if you go around in a circle covering all angles it would be 360 degrees.
Simply add up the known values 112 and 122 and 2x, where there are 2 unknowns. M1 and m3. Solve for x and that would be the values for the angles.
