The playground of Xinming Primary School is 45.5 meters wide, which is half of its length. What is the area of the playground?
新明小学的操场宽45.5米，是长的一半，操场的面积是多少？
<gadget id="calculator">45.5 * 2</gadget>
<output>91</output>

<gadget id="calculator">91 * 45.5</gadget>
<output>4_140.5</output>

<result>4_140.5</result>