square is obtained by expanding the sides of a cylinder with a height of 6.28 cm. What is the area of the base of the cylinder in square centimeters?
把一个高6.28厘米的圆柱的侧面展开得到一个正方形，这个圆柱的底面积是多少平方厘米．
<gadget id="calculator">6.28 / 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>