If the central angles of the two sectors are equal and the radius of the large sector is twice the radius of the small sector, then how many times the area of the large sector is the area of the small sector.
如果两个扇形的圆心角相等，大扇形的半径是小扇形的半径的2倍，那么大扇形的面积是小扇形的面积的多少倍．
<gadget id="calculator">2 ** 2</gadget>
<output>4</output>

<result>4</result>