Find the angles that are obtained when two lines intersect. If the sum of three of these angles is 300 degrees.

The solution of the problem:
1. Let’s find what is the fourth angle obtained at the intersection of two straight lines.
360 – 300 = 60 degrees.
2. What is the third corner adjacent to the fourth corner?
180 – 60 = 120 degrees.
3. Find out what is the degree measure of the second angle adjacent to the third, at the intersection of two straight lines.
180 – 120 = 60 degrees.
4. Find the sum of three angles.
60+ 120 + 60 = 240 degrees.
5. What is the degree measure of the first angle.
360 – 240 = 120 degrees.
Answer: When two straight lines intersect, the first and second angles are 120 degrees, the second and fourth are 60 degrees.