In the middle is a square with a side length of 1 cm, and each side of the square is connected with a sector with a central angle of 90°. What is the area of the entire figure?
中间是边长为1cm的正方形，与这个正方形每一条边相连的都是圆心角为90°的扇形．整个图形的面积是多少？
<gadget id="calculator">1 * 1</gadget>
<output>1</output>

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

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

<gadget id="calculator">1 + 3.14</gadget>
<output>4.14</output>

<result>4.14</result>