The radius of the small circle is 3 cm, the radius of the large circle is 5 cm, what is the area of the small circle equal to the area of the large circle
小圆半径是3厘米，大圆半径是5厘米，小圆面积是大圆面积的多少
<gadget id="calculator">3 ** 2</gadget>
<output>9</output>

<gadget id="calculator">3.14 * 9</gadget>
<output>28.26</output>

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

<gadget id="calculator">3.14 * 25</gadget>
<output>78.5</output>

<gadget id="calculator">28.26 / 78.5</gadget>
<output>0.36</output>

<result>0.36</result>