Divide a circle with a diameter of 6 decimeters into several small sectors (even number), and then assemble these small sectors into an approximate rectangle. What is the perimeter of this approximately rectangle in decimeters?
把一个直径是6分米的圆平均分成若干个小扇形(偶数个)，再把这些小扇形拼成一个近似长方形，这个近似长方形的周长是多少分米．
<gadget id="calculator">3.14 * 6</gadget>
<output>18.84</output>

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

<result>24.84</result>