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Triangle ABC is an right angle one 
 so ac^2=ab^2+bc^2
 so AC=5
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if it helps u...PLZ MARK AS BEST
hey 4*4 =16 noo then how 15 came
It will be solved through Pythagoras Theorem.
so,     AC=5
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AC = root 25 not AC sq. = root 25 dear :)
oh yeah sorry , by mistake
:) no prob
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