What is the measure of the acute angle between the hour and minute hands of a correctly
working clock at 4:18 ?
Select:
A) 12◦
B) 15◦
C) 18◦
D) 21◦
E) 24◦
Consider an axis through the center of the clock with direction, the direction of the hands of the   clock at 12:00. At 4:18 the angle between the axis and the hour hand is   (4+18/60)*360◦/12=129◦   The angle between the axis and the minute hand is 18/60*360◦(4+18/60)*360 /12= 
<gadget id="calculator">(4+18/60)*360 /12</gadget>
<output>129</output>
129◦   The angle between the axis and the minute hand is 18/60*360= 
<gadget id="calculator">18/60*360</gadget>
<output>108</output>
108◦   correct answer 21◦
<result>D</result>
What is the measure of the acute angle between the hour and minute hands of a correctly
working clock at 4:18 ?