Suppose the other angle is x
Both the down angles are 68 as they are the sides are equal and angles are equal.(or you can say base angles of isosceles triangle)
68 + 68 + x = 180
136+x = 180
x=180-136
x=44
x=m ( Vertically opposite angle)
44 =m
n+n+m =180( sum of interior angle of triangle)
2n +44=180
2n=180 - 44
2n=136
n=136/2
n=68
Hence, n = 68 and m =44