Known, r=4 decimeters, h=3 decimeters. Find the surface area of the cylinder.
已知，r=4分米，h=3分米．求圆柱的表面积．
<gadget id="calculator">2 * 3.14 * 4 * 3</gadget>
<output>75.36</output>

<gadget id="calculator">4 ** 2</gadget>
<output>16</output>

<gadget id="calculator">3.14 * 16 * 2</gadget>
<output>100.48</output>

<gadget id="calculator">75.36 + 100.48</gadget>
<output>175.84</output>

<result>175.84</result>