The side view of a cylinder is a square. It is known that the circumference of its base is 12.56 cm. What is the surface area of the cylinder (π takes 3.14).
一个圆柱的侧面展开图是正方形，已知它的底面周长是12.56厘米，这个圆柱的表面积是多少(π取3.14)．
<gadget id="calculator">12.56 * 12.56</gadget>
<output>157.7536</output>

<gadget id="calculator">12.56 / 3.14 / 2</gadget>
<output>2</output>

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

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

<gadget id="calculator">157.7536 + 25.12</gadget>
<output>182.8736</output>

<result>182.8736</result>