Xiao Ming runs 4 laps around a playground with a length of 21 meters and a width of 4 meters every morning. How many meters has he run in total?
小明每天早上绕着一个长是21米，宽是4米的操场跑4圈，他一共跑了多少米？
<gadget id="calculator">21 + 4</gadget>
<output>25</output>

<gadget id="calculator">25 * 2 * 4</gadget>
<output>200</output>

<result>200</result>