A cylindrical glass fish tank with a bottom diameter of 30 cm. When a fish is taken out, the water level drops by 1 cm. What is the volume of the fish in cubic centimeters?
一个圆柱形玻璃鱼缸，底面直径30厘米，把里面的一条鱼捞出来后水面下降1厘米，这条鱼的体积是多少立方厘米．
<gadget id="calculator">30 / 2</gadget>
<output>15</output>

<gadget id="calculator">15 ** 2</gadget>
<output>225</output>

<gadget id="calculator">3.14 * 225 * 1</gadget>
<output>706.5</output>

<result>706.5</result>