A rectangular playground is 210 meters long and 90 meters wide. Xiaohua ran three laps along the side of the playground. How many meters did he run in total?
一个长方形操场，长210米，宽90米．小华沿操场的边跑了三圈，他一共跑了多少米？
<gadget id="calculator">210 + 90</gadget>
<output>300</output>

<gadget id="calculator">300 * 2 * 3</gadget>
<output>1_800</output>

<result>1_800</result>