The sum of all the interior angles in a hexagon is 720°, so if you add up all the angles and then take them away from 720, you'll get your answer: 152 + 85 = 237 237 + 85 = 322 322 + 125 = 447 447 + 135 = 582 So 720 - 582 = 138°, which is your answer. I hope this helps!
