Solve the missing angle. Round to the nearest whole number.

Answer 1

if you know all the other interior angles of a polygon, subtract their sum from (n-2)(180) where n = the number of sides of the polygon

if it's a triangle then angle A = 180-B-C

if it's a quadrilateral the angle A = 360-B-C-D

if it's a pentagon, the angle A = 540-B-C-D-E

if it's an n sided polygon then angle A = (n-2)(180) minus sum of all other angles