To draw a circle with a circumference of 18.84 centimeters, use the two corners of the compass to measure the distance in centimeters on the ruler.
要画个周长是18.84厘米的圆，用圆规的两角在直尺上应量取多少厘米的距离．
<gadget id="calculator">18.84 / 3.14 / 2</gadget>
<output>3</output>

<result>3</result>