A container with a diameter of 10 cm contains a small ball with a diameter of 2 cm. It is completely submerged in water and the water surface drops 1 cm after being taken out. What is the volume of the small ball in cubic centimeters?
一个容器直径是10厘米，里面装着一个直径是2厘米的小圆珠，完全浸没在水中拿出后水面下了1厘米．小圆珠体积是多少立方厘米？
<gadget id="calculator">10 / 2</gadget>
<output>5</output>

<gadget id="calculator">5 ** 2</gadget>
<output>25</output>

<gadget id="calculator">3.14 * 25 * 1</gadget>
<output>78.5</output>

<result>78.5</result>