A cylinder has a base diameter of 6 cm and a height of 9 cm. What is the surface area of the cylinder in square centimeters?
一个圆柱的底面直径为6厘米，高为9厘米，圆柱的表面积是多少平方厘米？
<gadget id="calculator">3.14 * 6 * 9</gadget>
<output>169.56</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">169.56 + 56.52</gadget>
<output>226.08</output>

<result>226.08</result>