in a right angled triangle the three vectors a bar b bar and c bar add to zero a bar , b bar is
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. = 0
Explanation:
- Given, + + = 0
- , , are three sides of a triangle.
- ||= 4 unit, ||= 3 unit, || = 5 unit
- As, + + = 0
⇒ + = -
Taking square on both sides, ( + ).( + ) = .
||² + ||² + 2(.) = ||²
4² + 3² + 2(.) = 5²
16 + 9 + 2(.) = 25
2(.) = 25 - 25 = 0
(.) = 0
∴ We got . = 0
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