A clock has a circular shape therefore there's 360° central angle. The clock is divided into 12 equal parts because there are 12 hours.
=360°/12
=30°
Therefore, as the clock hour hand moves from 1 to 2 they moved 30°
= 30° (2 - 1)
= 30°
12:00 to 12:20
at 12:00 the clock hour hand is in 12
at 12:20 the clock hour hand is still in 12 but the minute hand is now located at 20/5 or 4.
Because the hour hand did not moved therefore the angle is 0°
