The large circle is (3/2) the circumference of the small circle, so the small circle is the area of the large circle.
大圆是小圆周长的(3/2)，那么小圆是大圆面积的多少．
<gadget id="calculator">4 / 9</gadget>
<output>4/9 = around 0.444444</output>

<result>4/9 = around 0.444444</result>