If the circumference of the circle is reduced to the original (1/3), what is the area of the circle?
圆的周长缩小为原来的(1/3)，那么圆的面积是原来的多少．
<gadget id="calculator">1 / 3</gadget>
<output>1/3 = around 0.333333</output>

<gadget id="calculator">(1/3) * (1/3)</gadget>
<output>1/9 = around 0.111111</output>

<result>1/9 = around 0.111111</result>