A rectangular piece of land has a perimeter of 100 meters and a length of 34 meters. What is the area?
一块长方形地，周长是100米，长是34米，面积有多大？
<gadget id="calculator">100 / 2</gadget>
<output>50</output>

<gadget id="calculator">50 - 34</gadget>
<output>16</output>

<gadget id="calculator">16 * 34</gadget>
<output>544</output>

<result>544</result>