What is the surface area of a cylindrical object whose base diameter and height are both 6 cm?
一个圆柱形物体底面直径和高都是6厘米，它的表面积是多少平方厘米．
<gadget id="calculator">3.14 * 6 * 6</gadget>
<output>113.04</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">113.04 + 56.52</gadget>
<output>169.56</output>

<result>169.56</result>