The area of a semicircle is 4.5 times the area of a small circle. If the circumference and area of the small circle are the same, what is the circumference of the semicircle?
一个半圆的面积是一个小圆面积的4.5倍，如果这个小圆的周长和面积数值相同，那么这个半圆的周长是多少？
<gadget id="calculator">3.14 * 2 * 2</gadget>
<output>12.56</output>

<result>12.56</result>