Angle 4 is 20 degrees greater than angle 3. Find all corners.

Let angle 3 be x degrees, then angle 4 is x + 20 degrees. We know that the sum of the degree measures of adjacent angles is 180 degrees. Let’s make the equation:

x + x + 20 = 180;

x + x = 180 – 20;

x + x = 160;

x * (1 + 1) = 160;

x * 2 = 160 (in order to find an unknown factor, you need to divide the product by a known factor);

x = 160: 2;

x = 80 degrees – angle 3;

80 + 20 = 100 degrees – angle 4.

Angle 3 = Angle 1 = 80 degrees;

angle 2 = angle 4 = 100 degrees.

Answer: 80 degrees; 80 degrees; 100 degrees; 100 degrees.