Answer:
Angle B= 40 Degrees
Angle A= 80 Degrees
Explanation: Angle B and 140 degrees are supplementary angles, which add up to 180 degrees because they are adjacent and form a line, 180-140 degrees is 40, so Angle B is 40 degrees. Knowing that, and that the interior of a triangle is equal to 180 degrees, we can add the two angles we already know, 60 and 40, making 100 degrees. Therefore, angle A is equal to 80 degrees. 180-100=80