If the circumference of circle A is 1/3 of the circumference of circle B, then the area of circle A is equal to the area of circle B.
若甲圆周长是乙圆周长的(1/3)，那么甲圆面积是乙圆面积的多少．
<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>