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2015-03-29T18:45:23+05:30

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Triangle ABC is an right angle one 
 so ac^2=ab^2+bc^2
            =3^2+4^2
            =9+15
            =25
 so AC=5
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hey 4*4 =16 noo then how 15 came
2015-03-30T20:05:38+05:30
It will be solved through Pythagoras Theorem.
now,
        (AC)²=(AB)²+(BC)²
                =(3)²+(4)²
                =9+16
        (AC)²=√25
so,     AC=5
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AC = root 25 not AC sq. = root 25 dear :)
oh yeah sorry , by mistake
:) no prob