The side length of a square is 9 cm, and its perimeter is equal to the perimeter of another rectangle. If the length of the rectangle is 10 cm, what is the area of the rectangle in square centimeters?
一个正方形的边长是9厘米，它的周长与另一个长方形的周长相等，如果长方形的长是10厘米，那么长方形的面积是多少平方厘米．
<gadget id="calculator">9 * 4</gadget>
<output>36</output>

<gadget id="calculator">36 / 2</gadget>
<output>18</output>

<gadget id="calculator">18 - 10</gadget>
<output>8</output>

<gadget id="calculator">10 * 8</gadget>
<output>80</output>

<result>80</result>