The perimeter of a rectangle is 140 decimeters, its length is known to be 38 decimeters, what is the area of this rectangle?
一个长方形的周长是140分米，已知它的长是38分米，这个长方形的面积是多少？
<gadget id="calculator">140 / 2</gadget>
<output>70</output>

<gadget id="calculator">70 - 38</gadget>
<output>32</output>

<gadget id="calculator">38 * 32</gadget>
<output>1_216</output>

<result>1_216</result>