At 4:30 p.m. on January 1st, the school held a celebration. What is the angle formed by the hour hand and the minute hand on the clock face?
1月1日下午4时30分学校举行了庆祝活动，那时钟面上的时针与分针组成的角是多少度．
<gadget id="calculator">2 * 30</gadget>
<output>60</output>

<gadget id="calculator">0.5 * 30</gadget>
<output>15</output>

<gadget id="calculator">60 - 15</gadget>
<output>45</output>

<result>45</result>