internal angles of the polygon
angle a = 180 - 45 = 135°
angle b = 180 - 90 = 90°
angle c = 180 - 60 = 120°
angle d = 540 - 135 - 90 - 120 - 77 = 118°
angle e = 180 - 103 = 77 °
angle x = 180 - 118 = 62°
the polygon is not a regular polygon because the measure of its angles are different
