Cut a cone along the diameter of the base, and the longitudinal section is an isosceles triangle whose base and height are both 10 cm. What is the volume of this cone?
把一个圆锥沿底面直径切开，纵切面是底和高都是10厘米的等腰三角形．这个圆锥的体积是多少？
<gadget id="calculator">1 / 3</gadget>
<output>1/3 = around 0.333333</output>

<gadget id="calculator">10 / 2</gadget>
<output>5</output>

<gadget id="calculator">5 ** 2</gadget>
<output>25</output>

<gadget id="calculator">(1/3) * 3.14 * 25 * 10</gadget>
<output>261.666667</output>

<result>261.666667</result>