cone with a height of 5 cm is vertically cut into two equal parts along its height, and the area of the cross-section is known to be 0.2 square decimeters, then, what is the diameter of the base of the cone in cm?
一个高是5厘米的圆锥，沿着它的高垂直截成相等的两部分，已知截面的面积是0.2平方分米，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">0.2 * 100 * (2/5)</gadget>
<output>8</output>

<result>8</result>