Determine the view of the corner adjacent to the 80 degree angle.

In the task condition, it is necessary to determine the type of corner. For this it is necessary to present them all. There are three types in total: obtuse (angle greater than 90 °), straight (angle 90 °), acute (angle less than 90 °). They can be determined not only by the degree measure, but also by their appearance.

In this task, adjacent angles are given. And adjacent angles are those angles that have a common side. And their sum is 180 °.

If one such angle is 80 °, then the second is – 100 ° (180 – 80 = 100). Hence, the angle is obtuse (more than 90 °).

Answer: stupid.