A closed cylindrical oil tank has a base radius of 3m and a height of 5m. What is the surface area of the oil tank in square meters?
一个封闭的圆柱形油罐，底面半径是3m，高5m，这个油罐的表面积是多少平方米？
<gadget id="calculator">3 ** 2</gadget>
<output>9</output>

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

<gadget id="calculator">3.14 * 3 * 2 * 5</gadget>
<output>94.2</output>

<gadget id="calculator">56.52 + 94.2</gadget>
<output>150.72</output>

<result>150.72</result>