Answer:
√4
Step-by-step explanation:
Step1: Square ABCD and square EFGH overlap in such a way that EF bisect BC and EH bisect DC.
Step 2: draw a line to join point C to point E and point C to point F to produce an equilateral triangle ECF (since the distance from E to C is 2√3 and C to F is 2√2) distance from E to F will be 2√2 for equilateral triangle.
Step 3: the overlapping region will then be square of side (2√2)/2 = √2
Hence, area of the overlapping region will be area of the square (shaded in the attachment below)
√2 *√2 = 2 or √4