A cylinder has a base diameter of 6 decimeters and a height of 20 decimeters. What is the surface area of this cylinder in square decimeters?
一个圆柱体，底面直径是6分米，高20分米．这个圆柱的表面积是多少平方分米？
<gadget id="calculator">3.14 * 6 * 20</gadget>
<output>376.8</output>

<gadget id="calculator">6 / 2</gadget>
<output>3</output>

<gadget id="calculator">3 ** 2</gadget>
<output>9</output>

<gadget id="calculator">3.14 * 9 * 2</gadget>
<output>56.52</output>

<gadget id="calculator">376.8 + 56.52</gadget>
<output>433.32</output>

<result>433.32</result>