Use a square to cover the entire circle with an area of 50.24 square centimeters. What is the minimum length of the sides of this square?
用一个正方形去盖住整个面积是50.24平方厘米的圆，这个正方形的边长至少是多少厘米．
<gadget id="calculator">4 * 2</gadget>
<output>8</output>

<result>8</result>