There are large and small circular patterns on the outer wall of the swimming pool in our school. The diameter of one of the circles is 1 meter. What is the circumference of this circle in meters?
我校游泳馆外墙面上有大大小小的圆形图案，其中一个圆的直径是1米，这个圆的周长是多少米．
<gadget id="calculator">3.14 * 1</gadget>
<output>3.14</output>

<result>3.14</result>