Naughty used two pieces of plasticine of the same size to knead a cylinder and a cone with a bottom radius of 3 cm. It is known that the height of the cone is 12 cm. What is the height of the cylinder?
淘气用两块同样大小的橡皮泥分别捏成了底面半径都是3厘米的圆柱和圆锥，已知圆锥的高是12厘米，圆柱的高是多少．
<gadget id="calculator">1 / 3</gadget>
<output>1/3 = around 0.333333</output>

<gadget id="calculator">12 / 1</gadget>
<output>12</output>

<gadget id="calculator">(1/3) * 12</gadget>
<output>4</output>

<result>4</result>