A cylinder has a base of radius 2 cm and a height of 3 cm. What is its surface area in square centimetres.
一个圆柱的底面半径2厘米，高3厘米．它的表面积是多少平方厘米．
<gadget id="calculator">2 ** 2</gadget>
<output>4</output>

<gadget id="calculator">3.14 * 4 * 2</gadget>
<output>25.12</output>

<gadget id="calculator">2 * 3.14 * 2 * 3</gadget>
<output>37.68</output>

<gadget id="calculator">25.12 + 37.68</gadget>
<output>62.8</output>

<result>62.8</result>