The volume of the cone and the cylinder are equal, the area of the base of the cone is 8.4 square centimeters, the area of the base of the cylinder is 2.1 square centimeters, the height of the cone is the height of the cylinder ((())/(())).
圆锥体与圆柱体体积相等，圆锥底面积是8.4平方厘米，圆柱底面积是2.1平方厘米，圆锥的高是圆柱高的((())/(()))．
<gadget id="calculator">3 / 4</gadget>
<output>3/4 = around 0.75</output>

<result>3/4 = around 0.75</result>