rectangle has a circumference of 30.2 decimeters and a length of 10.1 decimeters. What is the area of this rectangle?
一个长方形周长30.2分米，长10.1分米，这个长方形面积是多少？
<gadget id="calculator">30.2 / 2</gadget>
<output>15.1</output>

<gadget id="calculator">15.1 - 10.1</gadget>
<output>5</output>

<gadget id="calculator">10.1 * 5</gadget>
<output>50.5</output>

<result>50.5</result>