The total area of two circles is 52 square centimeters, the ratio of their radii is 2:3, what is the area of the smaller circle in square centimeters
两个圆的面积共有52平方厘米，它们的半径比是2：3，小圆面积为多少平方厘米
<gadget id="calculator">4 + 9</gadget>
<output>13</output>

<gadget id="calculator">4 / 13</gadget>
<output>4/13 = around 0.307692</output>

<gadget id="calculator">52 * (4/13)</gadget>
<output>16</output>

<result>16</result>