Use two iron wires of the same length to form a rectangular frame and a square frame respectively. The areas enclosed by the frame are 24 square centimeters and 25 square centimeters respectively. Find the length of this iron wire.
用两根同样长的铁丝分别围成一个长方形和正方形的框架，框架所围成的面积分别是24平方厘米和25平方厘米，求这根铁丝的长．
<gadget id="calculator">5 * 4</gadget>
<output>20</output>

<result>20</result>