The perimeter of a rectangle is 58cm, and the known width is 12cm. What is the area of the rectangle in cm**2.
一个长方形的周长是58cm，已知宽是12cm，这个长方形的面积是多少cm**2．
<gadget id="calculator">58 / 2</gadget>
<output>29</output>

<gadget id="calculator">29 - 12</gadget>
<output>17</output>

<gadget id="calculator">17 * 12</gadget>
<output>204</output>

<result>204</result>