Divide a circle with a radius of 2 cm into several equal parts, cut them out and put them together to form a rectangle. What is the perimeter of this rectangle?
把一个半径为2厘米的圆，等分成若干份，剪开拼成一个的长方形，这个长方形的周长是多少．
<gadget id="calculator">3.14 * 2 * 2</gadget>
<output>12.56</output>

<gadget id="calculator">2 * 2</gadget>
<output>4</output>

<gadget id="calculator">12.56 + 4</gadget>
<output>16.56</output>

<result>16.56</result>