The angle between 4 o'clock and 12 o'clock marks can be calculated by multiplying the number of hours between the two marks by the angle between the hour marks. In this case, the number of hours between the two marks is 8 (since there are 8 hours from 4 o'clock to 12 o'clock), and the angle between the hour marks is 30 degrees.
So, the angle between the 4 o'clock and 12 o'clock marks is:
8 hours x 30 degrees/hour = 240 degrees
However, we need to find the angle a line from the four o'clock mark to the twelve o'clock mark makes with a horizontal line. Since the clock face is circular, the line connecting the two marks is a chord of the circle. The angle between the chord and the horizontal line passing through the center of the circle is half the angle between the two marks.
Therefore, the angle we are looking for is:
240 degrees / 2 = 120 degrees
So, the line from the four o'clock mark to the twelve o'clock mark makes a 120-degree angle with a horizontal line.