To draw a circle with a diameter of 15 cm. How many centimeters should the distance between the legs of the compass be?
要画一个直径是15厘米的圆．圆规两脚叉开的距离应该是多少厘米．
<gadget id="calculator">15 / 2</gadget>
<output>15/2 = around 7.5</output>

<result>15/2 = around 7.5</result>