Divide a circle into 16 equal parts, and then cut it into an approximate rectangle. The width of this rectangle is 3 decimeters. What is the length of this rectangle?
把一个圆分成16等分，然后剪拼成一个近似的长方形，这个长方形的宽是3分米，这个长方形的长是多少分米．
<gadget id="calculator">3 / 2</gadget>
<output>3/2 = around 1.5</output>

<gadget id="calculator">2 * 3.14 * (3/2)</gadget>
<output>9.42</output>

<result>9.42</result>