A wire can form a square whose side length is 12.56 decimeters. What is the approximate area of the largest circle surrounded by this wire?
一根铁丝可以围成一个边长是12.56分米的正方形．如果把这根铁丝围成一个最大的圆，它的面积约是多少？
<gadget id="calculator">12.56 * 4</gadget>
<output>50.24</output>

<gadget id="calculator">50.24 / 3.14 / 2</gadget>
<output>8</output>

<gadget id="calculator">8 ** 2</gadget>
<output>64</output>

<gadget id="calculator">3.14 * 64</gadget>
<output>200.96</output>

<result>200.96</result>