The width of a rectangle is 4.2 meters, and the length is 4 times the width. What is the area of the rectangle?
一个长方形的宽是4.2米，长是宽的4倍，这个长方形的面积是多少平方米？
<gadget id="calculator">4.2 * 4 * 4.2</gadget>
<output>70.56</output>

<result>70.56</result>