who give first and answer is correct i mark it brainliest and thank and follow him, her ok
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Explanation:
Now, putting the value of x
AB=3x=9cm
BC=4x=12cm
AC=5x=15cm
On using Pythagoras theorem
AC
2
=AB
2
+BC
2
=(9)
2
+(12)
2
=81+144
AC
2
=225
AC=15cm
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