Yaya draws a circle with a diameter of 7 cm. What is the distance between the two feet of the compass in cm?
丫丫画一个直径是7厘米的圆，圆规两脚之间的距离应该是多少厘米．
<gadget id="calculator">7 / 2</gadget>
<output>7/2 = around 3.5</output>

<result>7/2 = around 3.5</result>