A ring competition is being held on one side of the playground. The students form a circle. A short bamboo pole is erected in the center of the circle for the students to set up. The distance between each student and the bamboo pole is 3 meters. What is the area surrounded by them? square meter?
操场的一边正在举行套圈比赛，只见同学们围成一个圆圈，在圆心位置竖着一根短竹竿让同学们套，每位同学与竹竿的距离为3米，他们围成的面积是多少平方米？
<gadget id="calculator">3 ** 2</gadget>
<output>9</output>

<gadget id="calculator">3.14 * 9</gadget>
<output>28.26</output>

<result>28.26</result>