If a square with a side length of 6 cm has the same area as a rectangle with a width of 4 cm, what is the length of the rectangle in cm?
一个边长为6厘米的正方形与一个宽4厘米的长方形面积相等，则长方形的长是多少厘米．
<gadget id="calculator">6 / 4</gadget>
<output>3/2 = around 1.5</output>

<gadget id="calculator">6 * (3/2)</gadget>
<output>9</output>

<result>9</result>