There is a cylindrical glass with a base diameter of 4 cm and a height of 15 cm. What is the volume of this glass?
有一个圆柱形玻璃杯，它的底面直径是4厘米，高是15厘米，这个玻璃杯的容积是多少？
<gadget id="calculator">4 / 2</gadget>
<output>2</output>

<gadget id="calculator">2 ** 2</gadget>
<output>4</output>

<gadget id="calculator">3.14 * 4 * 15</gadget>
<output>188.4</output>

<result>188.4</result>