The radius of the large circle is twice the radius of the small circle, and the area of the small circle is 12 square decimeters less than the area of the large circle. What is the area of the small circle in square decimeters?
大圆半径是小圆半径的2倍，小圆面积比大圆面积少12平方分米，小圆面积是多少平方分米
<gadget id="calculator">4 - 1</gadget>
<output>3</output>

<gadget id="calculator">12 / 3</gadget>
<output>4</output>

<gadget id="calculator">4 * 1</gadget>
<output>4</output>

<result>4</result>