A cone with a height of 5 cm is cut vertically into two equal parts along its height. Given that the area of the cross-section is 20 square centimeters, what is the diameter of the base of the cone in centimeters?
一个高是5厘米的圆锥，沿着它的高垂直切成相等的两部分．已知截面的面积是20平方厘米，那么圆锥的底面直径是多少厘米．
<gadget id="calculator">2 / 5</gadget>
<output>2/5 = around 0.4</output>

<gadget id="calculator">20 * (2/5)</gadget>
<output>8</output>

<result>8</result>