If the radius of the large circle is twice the radius of the small circle, then how many times is the area of the large circle equal to the area of the small circle?
大圆半径是小圆半径的2倍，则大圆面积是小圆面积的多少倍．
<gadget id="calculator">2 ** 2</gadget>
<output>4</output>

<gadget id="calculator">3.14 * 4</gadget>
<output>12.56</output>

<gadget id="calculator">1 ** 2</gadget>
<output>1</output>

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

<gadget id="calculator">12.56 / 3.14</gadget>
<output>4</output>

<result>4</result>