There are two circles, the radius of the small circle is 2/3 of the large circle, and the area of the large circle is how many times that of the small circle.
有两个圆，小圆半径是大圆的(2/3)，大圆面积是小圆的多少倍．
<gadget id="calculator">9 / 4</gadget>
<output>9/4 = around 2.25</output>

<result>9/4 = around 2.25</result>