One of the adjacent corners is 2 times the size of the other. Find these corners.

Let’s solve this problem using the equation.
Let one of the adjacent angles be x degrees, then the second of the adjacent angles is 2 * x degrees. We know that the sum of the degree measures of adjacent angles is 180 degrees. Let’s make the equation:
x + 2 * x = 180;
x * (1 + 2) = 180;
x * 3 = 180 (in order to find an unknown factor, you need to divide the product by a known factor);
x = 180: 3;
x = 60 degrees – one of the adjacent angles;
2 * 60 = 120 degrees is the second of the adjacent corners.
Answer: 60 degrees; 120 degrees.