There is a circular flower bed in Yucai Primary School. The radius of the bottom is 2 meters. If you want to surround the flower bed 4 times with ribbons, how many meters of ribbons will you need at least?
育才小学有一个圆形花坛，底面半径是2米，要用彩带把花坛围上4圈，至少需要多少米彩带？
<gadget id="calculator">3.14 * 2 * 2 * 4</gadget>
<output>50.24</output>

<result>50.24</result>