The area of a square is 5 square centimeters. If a circle is drawn with a vertex of the square as the center and the side length of the square as the radius, what is the area of the circle in square centimeters?
一个正方形的面积是5平方厘米，若以正方形的一个顶点为圆心，正方形的边长为半径画圆，那么圆的面积是多少平方厘米？
<gadget id="calculator">3.14 * 5</gadget>
<output>15.7</output>

<result>15.7</result>