If the legs of the compass are 1.5 cm apart, what is the circumference of the circle drawn?
如果圆规两脚叉开1.5cm，画出圆的周长是多少．
<gadget id="calculator">1.5 * 2</gadget>
<output>3</output>

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

<result>9.42</result>