If the circumference of the base of a cylinder is 6.28 decimeters and the height is 10 decimeters, what is the surface area in square decimeters?
一个圆柱的底面周长是6.28分米，高10分米，表面积是多少平方分米．
<gadget id="calculator">6.28 * 10</gadget>
<output>62.8</output>

<gadget id="calculator">6.28 / 3.14 / 2</gadget>
<output>1</output>

<gadget id="calculator">1 ** 2</gadget>
<output>1</output>

<gadget id="calculator">3.14 * 1 * 2</gadget>
<output>6.28</output>

<gadget id="calculator">62.8 + 6.28</gadget>
<output>69.08</output>

<result>69.08</result>