Xiao Ming ran a circle along the 200-meter-long rectangular playground, and ran a total of 600 meters. What is the area of this playground?
小明沿着长200米的长方形操场跑了一圈，共跑了600米．这个操场的面积是多少？
<gadget id="calculator">600 / 2</gadget>
<output>300</output>

<gadget id="calculator">300 - 200</gadget>
<output>100</output>

<gadget id="calculator">200 * 100</gadget>
<output>20_000</output>

<result>20_000</result>