The radius of the base of a cone is (1/2) the radius of the base of a cylinder, and the ratio of the height of the cylinder to the height of the cone is 4:5, so the volume of the cone is the volume of the cylinder.
一个圆锥的底面半径是一个圆柱底面半径的(1/2)，圆柱的高与圆锥高的比是4：5，那么圆锥的体积是圆柱体积的多少．
<gadget id="calculator">1 / 2</gadget>
<output>1/2 = around 0.5</output>

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

<gadget id="calculator">(1/2) * (1/2) * 1 * (1/3)</gadget>
<output>1/12 = around 0.083333</output>

<gadget id="calculator">4 / 5</gadget>
<output>4/5 = around 0.8</output>

<gadget id="calculator">1 * (4/5)</gadget>
<output>4/5 = around 0.8</output>

<gadget id="calculator">(1/12) / (4/5)</gadget>
<output>5/48 = around 0.104167</output>

<result>5/48 = around 0.104167</result>