Draw a circle with a diameter of 5 cm, what is the distance in cm between the two legs of the compass.
画一个直径5cm的圆，圆规两脚间张开的距离是多少cm．
<gadget id="calculator">5 / 2</gadget>
<output>5/2 = around 2.5</output>

<result>5/2 = around 2.5</result>