the sum of the measure of the interior angles of a polygon are : (n - 2)*(180)..with n being the number of sides
u have 6 sides.....so the total measures are : (6 - 2)(180) = 4(180) = 720
135 + 105 + 108 + 116 + 110 + A = 720
574 + A = 720
A = 720 - 574
A = 146 <==