Answer:
50
Step-by-step explanation:
Since the angle corresponding with 140 is complementary, we subtract it from 180.
180 - 140 = 40.
Then, we also know that another angle inside the triangle is 90 since it is a right angle, and we also know that the interior angles of a triangle add up to 180, so we subtract the sum of the angles from 180 to get the measure of angle 1.
40 + 90 = 130
180 - 130 = 50
Angle 1 is 50.
