The area of a classroom is 81.6 square meters, its length is 10.2 meters, what is its circumference in meters?
一间教室的面积是81.6平方米，它的长是10.2米，它的周长是多少米？
<gadget id="calculator">81.6 / 10.2</gadget>
<output>8</output>

<gadget id="calculator">10.2 + 8</gadget>
<output>18.2</output>

<gadget id="calculator">2 * 18.2</gadget>
<output>36.4</output>

<result>36.4</result>