If the circumference of the base of a cylinder is 12.56 cm and the height is 3 cm, what is the volume of a cone with the same base and height in cubic centimeters?
一个圆柱体的底面周长是12.56厘米，高是3厘米，与它等底等高的圆锥的体积是多少立方厘米．
<gadget id="calculator">12.56 / 3.14 / 2</gadget>
<output>2</output>

<gadget id="calculator">2 ** 2</gadget>
<output>4</output>

<gadget id="calculator">1 / 3</gadget>
<output>1/3 = around 0.333333</output>

<gadget id="calculator">3.14 * 4 * 3 * (1/3)</gadget>
<output>12.56</output>

<result>12.56</result>