A cylinder has the sum of its bases equal to its lateral area. Given that its height is 8 cm, find its volume.
一个圆柱体，它的两底面之和等于侧面积．已知它的高是8cm，求它的体积．
<gadget id="calculator">8 ** 2</gadget>
<output>64</output>

<gadget id="calculator">3.14 * 64 * 8</gadget>
<output>1_607.68</output>

<result>1_607.68</result>