rectangular playground has a perimeter of 340 meters and a width of 70 meters. What is its area in square meters?
一个长方形操场周长是340米，宽是70米，它的面积是多少平方米？
<gadget id="calculator">340 / 2</gadget>
<output>170</output>

<gadget id="calculator">170 - 70</gadget>
<output>100</output>

<gadget id="calculator">100 * 70</gadget>
<output>7_000</output>

<result>7_000</result>