The number of people participating in the chorus team in the school is represented by a fan with a central angle of 90° in the fan-shaped statistical chart, indicating how much the number of chorus teams accounts for the total number of interest groups
学校参加合唱队的人数，在扇形统计图中用圆心角是90°的扇形表示，说明合唱队人数占兴趣小组总人数的多少
<gadget id="calculator">90 / 360</gadget>
<output>1/4 = around 0.25</output>

<result>1/4 = around 0.25</result>