To use a compass to draw a circle with a diameter of 3 cm, what is the distance between the two legs of the compass in cm?
要用圆规画一个直径是3厘米的圆，圆规的两个脚之间距离应是多少厘米．
<gadget id="calculator">3 / 2</gadget>
<output>3/2 = around 1.5</output>

<result>3/2 = around 1.5</result>