Physics, asked by charu2312, 10 months ago

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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Answered by niharikam54
3

Answer:

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Answered by dikshaagarwal4442
1

Answer:

\vec{a}.\vec{b} = 0

Explanation:

  • Given, \vec{a} + \vec{b} + \vec{c} = 0
  • \vec{a}, \vec{b}, \vec{c}  are three sides of a triangle.
  • |\vec{a}|= 4 unit, |\vec{b}|= 3 unit, |\vec{c}| = 5 unit
  • As,  \vec{a} + \vec{b} + \vec{c} = 0

         ⇒   \vec{a} + \vec{b} = - \vec{c}

    Taking square on both sides,  ( \vec{a} + \vec{b}).( \vec{a} + \vec{b}) =  \vec{c}. \vec{c}

                                                      |\vec{a}|² + |\vec{b}|² + 2(\vec{a}.\vec{b}) = |\vec{c}

                                                      4² + 3² + 2(\vec{a}.\vec{b}) = 5²

                                                      16 + 9 + 2(\vec{a}.\vec{b}) = 25

                                                      2(\vec{a}.\vec{b}) = 25 - 25 = 0

                                                      (\vec{a}.\vec{b}) = 0

∴ We got \vec{a}.\vec{b} = 0

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