The radius of a circle is 4 cm. Cut the circle along the radius and divide it into several sectors, and then assemble them into an approximate rectangle. What is the perimeter of this rectangle in centimeters?
一个圆的半径是4厘米，把这个圆沿半径剪开分成若干个扇形，再拼成一个近似的长方形，这个长方形的周长是多少厘米．
<gadget id="calculator">4 / 2</gadget>
<output>2</output>

<gadget id="calculator">2 * 3.14 * 2</gadget>
<output>12.56</output>

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

<gadget id="calculator">16.56 * 2</gadget>
<output>33.12</output>

<result>33.12</result>