The side of the cylinder is a rectangle, the circumference is 47.1m, and the height is twice the diameter. Find the surface area of the cylinder.
圆柱侧面展开是长方形，周长47.1m，高是直径的2倍，求圆柱的表面积．
<gadget id="calculator">47.1 / 3.14 / 2</gadget>
<output>7.5</output>

<gadget id="calculator">7.5 ** 2</gadget>
<output>56.25</output>

<gadget id="calculator">3.14 * 56.25 * 2</gadget>
<output>353.25</output>

<gadget id="calculator">7.5 * 2 * 2</gadget>
<output>30</output>

<gadget id="calculator">47.1 * 30</gadget>
<output>1_413</output>

<gadget id="calculator">353.25 + 1_413</gadget>
<output>1_766.25</output>

<result>1_766.25</result>