If the whole circle is used to indicate that there are 40 students in the first class of the middle school, then the 5 students who are evaluated as excellent should be represented by a fan with the central angle of the circle.
如果用整个圆来表示中预1班共有同学40人，那么评优的5名同学应该用圆心角为多少的扇形来表示．
<gadget id="calculator">5 / 40</gadget>
<output>1/8 = around 0.125</output>

<gadget id="calculator">(1/8) * 360</gadget>
<output>45</output>

<result>45</result>