The diameter of the small circle and the radius of the large circle are both 4 cm. What is the circumference of the small circle equal to the circumference of the large circle?
小圆的直径和大圆的半径都是4厘米，小圆的周长是大圆周长的多少
<gadget id="calculator">1 / 2</gadget>
<output>1/2 = around 0.5</output>

<result>1/2 = around 0.5</result>