If the radius of a circle is tripled, how many times will the area be enlarged?
一个圆的半径扩大3倍，面积扩大多少倍
<gadget id="calculator">1 ** 2</gadget>
<output>1</output>

<gadget id="calculator">3.14 * 1</gadget>
<output>3.14</output>

<gadget id="calculator">3 ** 2</gadget>
<output>9</output>

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

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

<result>9</result>