There is a well with a diameter of 1.4 meters. Now we are going to add an iron manhole cover to it, and the diameter is required to be 50 cm longer than the wellhead. What is the area of the iron cover in square meters?
有一口井，井口直径是1.4米．现准备给它加上铁质井盖，要求直径比井口长50厘米．这个铁盖的面积是多少平方米？
<gadget id="calculator">1.4 + 0.5</gadget>
<output>1.9</output>

<gadget id="calculator">1.9 / 2</gadget>
<output>0.95</output>

<gadget id="calculator">0.95 ** 2</gadget>
<output>0.9025</output>

<gadget id="calculator">3.14 * 0.9025</gadget>
<output>2.83385</output>

<result>2.83385</result>