What is the measure of the third exterior angle of a triangle if the two exterior angles measures 140 and 160? *

Answer 1

the two exterior angles have interior angles of 40 and 20 degrees

180-40-20 = 120 degrees for the interior angle of the 3rd angle

it's exterior angle = 180-120 = 60 degrees

the 3 exterior angles sum to 360

140+160+60 = 360