The radius of the small circle is 3 cm, the diameter of the large circle is 8 cm, and the circumference of the small circle is equal to the circumference of the large circle.
小圆的半径是3厘米，大圆的直径是8厘米，小圆的周长是大圆周长的多少．
<gadget id="calculator">3 / 4</gadget>
<output>3/4 = around 0.75</output>

<result>3/4 = around 0.75</result>