The ratio of the diameters of the two circles is 3:5, and the area of the small circle is known to be 9 square meters, what is the area of the large circle?
两个圆的直径的比是3：5，已知小圆面积是9平方米，那么大圆面积是多少．
<gadget id="calculator">3 ** 2</gadget>
<output>9</output>

<gadget id="calculator">5 ** 2</gadget>
<output>25</output>

<gadget id="calculator">9 / 25</gadget>
<output>9/25 = around 0.36</output>

<gadget id="calculator">9 / (9/25)</gadget>
<output>25</output>

<result>25</result>