Question

hi please solve it fast

Answer 1

AC2+AB2=BC2

169-144=AB2

${ab}^{2} = \sqrt{25}$

ab2= 5

now in triangle aob

ao2+ob2= ab2

by converse of Pythagoras theorem we can say triangle aob is Right angle triangle

any doubt comments

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Answer 2

first you find AB by applying pathagorus therom. you get Ab= 5 cm

now in traingle ABC ,Ab= 5 cm AC =, 12 cm and

BC =13 cm and BC=√AB square +AC square

it is only possible when the traingle is right -angled traingle

now BC is hypotenuse so it's front side AB is perpendicular so and right angle at A