Xiao Ming wants to divide a circle with a diameter of 6 cm into an approximate rectangle after bisecting the radius. Do you know the perimeter of the rectangle?
小明要把一个直径6厘米的圆，沿半径平分后，拼成一个近似长方形，你知道拼成的这个长方形的周长吗？
<gadget id="calculator">3.14 * 6</gadget>
<output>18.84</output>

<gadget id="calculator">18.84 / 2</gadget>
<output>9.42</output>

<gadget id="calculator">6 / 2</gadget>
<output>3</output>

<gadget id="calculator">9.42 + 3</gadget>
<output>12.42</output>

<gadget id="calculator">12.42 * 2</gadget>
<output>24.84</output>

<result>24.84</result>