The ratio of the radius of the large circle to the diameter of the small circle is 8:4. If the circumference of the large circle is 25.12 cm, what is the area of the small circle in square centimeters?
大圆半径与小圆直径的比是8：4，如果大圆的周长是25.12厘米，则小圆的面积是多少平方厘米．
<gadget id="calculator">25.12 / 3.14 / 2</gadget>
<output>4</output>

<gadget id="calculator">1 / 4</gadget>
<output>1/4 = around 0.25</output>

<gadget id="calculator">4 * (1/4)</gadget>
<output>1</output>

<gadget id="calculator">1 ** 2</gadget>
<output>1</output>

<gadget id="calculator">3.14 * 1</gadget>
<output>3.14</output>

<result>3.14</result>