pls ans


draw a line MT || AB 
in the right angled triangle MST;
MT = AB = a+b
MS = AS-AM = AS- BT = a-b
applying the pythagoras theorem:

ST2=(a+b)2-(a-b)2=a2+b2+2ab-a2-b2+2ab=4ab
thus option (d) is correct.

hope this helps you

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