1 should be 21 because u have to add m(1)+112+57 and get 180°,,,, angle 2 should be 33 because there is a right angle (90°) and when u add 90+57=147 u gotta substract it from 180 and u get 33,,, angle 3 is 71 because there is another right angle (90°) and when u add 19 and 90 it’s 109 and substract from 180 and u get 71
