Answer:
40°, 140°, and 140°
Step-by-step explanation:
A parallelogram has 2 pairs of angles with equal measure.
If one angle is 40°, the angle opposite to that must also be 40°
A parallelogram has an internal angle sum of 360°.
2 angles we know add up to 80°, subtract that from 360° and you can find the other 2 angles..
360° - 80° = 280°
The other 2 angles add up to 280°, so
280°/2 = 140°
The other 2 angles are each 140°
