There are two circles, big and small, and it is known that the diameter of the larger circle is twice the diameter of the smaller circle, then how many times the area of the larger circle is the area of the smaller circle.
有大小两个圆，已知大圆的直径是小圆直径的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">4 / 3.14</gadget>
<output>1.273885</output>

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

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

<gadget id="calculator">3.14 * 1.273885 * 1</gadget>
<output>3.999999</output>

<result>3.999999</result>