The two outer corners of a triangle that do not have a common vertex are equal to 100 °.

The two outer corners of a triangle that do not have a common vertex are equal to 100 °. Find the corners of the triangle.

In the condition of this problem, a triangle and two outer corners of the triangle are given, which do not have a common vertex. The outer corner of the triangle and the inner corner of the triangle are adjacent corners. The sum of adjacent angles is 180 degrees.
1. Let’s find out what the two inner angles of the triangle are equal to.
180-100 = 80 degrees.
The sum of all three interior angles of a triangle is 180 degrees.
2. Find what is the third angle of the triangle.
180- (80 + 80) = 20 degrees.
Answer: One angle of the triangle is 80 degrees, the other = 80 degrees, the third = 20 degrees.