25% of the students in class 2 of the sixth grade participate in English extended learning. Use a circle to represent the whole class, and indicate the central angle of the fan-shaped circle of the students participating in English extended learning.
六年级2班有25%的同学参加英语拓展学习，用一个圆表示全班同学，表示参加英语拓展学习的同学的扇形圆心角为多少度．
<gadget id="calculator">25 / 100</gadget>
<output>1/4 = around 0.25</output>

<gadget id="calculator">360 * (1/4)</gadget>
<output>90</output>

<result>90</result>