Cut a circle with a radius of 6 cm into an approximate rectangle, and the perimeter of this rectangle is how many centimeters longer than the original perimeter.
把一个半径6厘米的圆剪拼成一个近似的长方形，这个长方形的周长比原的周长多多少厘米．
<gadget id="calculator">3.14 * 2 * 6</gadget>
<output>37.68</output>

<gadget id="calculator">37.68 / 2</gadget>
<output>18.84</output>

<gadget id="calculator">18.84 + 6</gadget>
<output>24.84</output>

<gadget id="calculator">24.84 * 2</gadget>
<output>49.68</output>

<gadget id="calculator">49.68 - 37.68</gadget>
<output>12</output>

<result>12</result>