It is known that the side view of a cylinder is a square, and the side length of the square is 12.56 decimeters. Now how many square centimeters of iron sheets are needed to make such a cylinder without a cover?
已知一圆柱的侧面展开图是正方形，正方形的边长是12.56分米，现要做这样一个无盖的圆柱形，至少需要多少平方厘米的铁皮？
<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</gadget>
<output>12.56</output>

<gadget id="calculator">157.7536 + 12.56</gadget>
<output>170.3136</output>

<result>170.3136</result>