The entire cycle of the 12 hours is 360∘ Each hour angle =
360
12
=30∘ At 8 O'clock, the minute hand is on the 12 and the hour hand is on the 8. The hourly intervals between them is 4 (11,10,9 and 8 ) Hence the angle between the hour and the minute hands =4×30∘=120∘.