The area of a square is 56.8 square meters, what is the area after its side length is doubled?
一个正方形的面积是56.8平方米，把它的边长扩大到原来的2倍后面积是多少．
<gadget id="calculator">2 * 2</gadget>
<output>4</output>

<gadget id="calculator">56.8 * 4</gadget>
<output>227.2</output>

<result>227.2</result>