r=3cm, h=9cm, find the surface area of this cylinder.
r=3厘米，h=9厘米，求这个圆柱的表面积．
<gadget id="calculator">2 * 3.14 * 3 * 9</gadget>
<output>169.56</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>