A cylinder is expanded to form a square with a perimeter of 25.12 cm. What is the area of the base of the cylinder?
一个圆柱体侧面展开后是一个周长为25.12厘米的正方形，这个圆柱的底面积是多少．
<gadget id="calculator">25.12 / 4 / 3.14 / 2</gadget>
<output>1</output>

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

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

<result>3.14</result>