What is the angle of the hour and minute hands of 30 minutes?

If you imagine everything on the dial of an ordinary wall clock, then when the hour hand is at 12, and the minute at 6 (30 minutes), then the angle between them is equal to 180 degrees (straight line), everything is exactly the same if, on the contrary, the minute is at 12 and the hour at 6, an angle of 180 degrees which can be measured with a protractor.