Two granaries of different sizes have circular bottoms. The diameter of the bottom of A warehouse is 4 meters. The floor area of B warehouse is (3/4) that of A warehouse.
两个大小不等的粮仓，底面都是圆形，甲仓底面直径是4米，乙仓的占地面积是甲仓的(3/4)，乙仓占地多少平方米？
<gadget id="calculator">4 / 2</gadget>
<output>2</output>

<gadget id="calculator">2 ** 2</gadget>
<output>4</output>

<gadget id="calculator">3 / 4</gadget>
<output>3/4 = around 0.75</output>

<gadget id="calculator">3.14 * 4 * (3/4)</gadget>
<output>9.42</output>

<result>9.42</result>