Maths Vector Algebra part 23 (Examples scalar Dot product) CBSE class 12 Mathematics XII

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Maths Vector Algebra part 23 (Examples scalar Dot product) CBSE class 12 Mathematics XII
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Sir,
AC is the hypotenuse so it should be AC(sq)=AB(sq)+BC(sq).
But you proved AB(sq)=AC(sq)+BC(sq)
Correct me if I'm wrong.

sarthaksharma