person starts from a certain place, turns right 30 degrees after advancing 20 meters, then turns right 30 degrees after advancing 20 meters, ..., and walks like this, how many meters has he walked when he returns to the starting point?
一个人从某地出发，前进20米就向右转30度，再前进20米又向右转30度，…，照这样走下去，当他回到出发点时共走了多少米．
<gadget id="calculator">360 / 30</gadget>
<output>12</output>

<gadget id="calculator">20 * 12</gadget>
<output>240</output>

<result>240</result>