If the perimeter of a rectangle is 26 meters and the length is 9 meters, what is its area in square meters?
一个长方形的周长是26米，长是9米，那么它的面积是多少平方米？
<gadget id="calculator">26 / 2</gadget>
<output>13</output>

<gadget id="calculator">13 - 9</gadget>
<output>4</output>

<gadget id="calculator">9 * 4</gadget>
<output>36</output>

<result>36</result>