The circumference of the base of cylinder A is twice the circumference of cylinder B. The height of cylinder B is three times that of cylinder A, and the volume of cylinder B is equal to the volume of cylinder A.
A圆柱底的周长是B圆柱周长的2倍．而B圆柱的高是A圆柱的3倍，B圆柱的体积是A圆柱体积的多少．
<gadget id="calculator">2 ** 2</gadget>
<output>4</output>

<gadget id="calculator">4 * 1</gadget>
<output>4</output>

<gadget id="calculator">3 / 4</gadget>
<output>3/4 = around 0.75</output>

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