The diameter of the bottom of a cylinder is 2 cm and the height is 6 cm. What is its lateral area?
一个圆柱体药瓶底面直径是2cm，高是6cm，它的侧面积是多少．
<gadget id="calculator">3.14 * 2 * 6</gadget>
<output>37.68</output>

<result>37.68</result>