Find the surface area of a cylinder with a base radius of 3 cm and a height of 5 cm.
求底面半径是3厘米，高是5厘米的圆柱的表面积．
<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>