Answer
a. $6^{\circ}$
b. $30^{\circ}$
c. $120^{\circ}$
Work Step by Step
In an hour, the minute hand moves through the entire circle, which is $360^{\circ}$. Since an hour is 60 minutes, each minute, the hand would move 360/60 = $6 ^{\circ}$. So the number of minutes just needs to be multiplied by $6 ^{\circ}$.
a. $6 ^{\circ}$/min * 1 min = $6 ^{\circ}$
b. $6 ^{\circ}$/min * 5 min = $30 ^{\circ}$
c. $6 ^{\circ}$/min * 20 min = $120 ^{\circ}$
