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atjari

  • 4 years ago

Please someone help me to do the second part of the question below. If O is any point within triangle ABC and P, Q, R are midpoints of the sides AB, BC, CA respectively. i)Prove that vectorOA+vectorOB+vectorOC=vectorOP+vectorOQ+vectorOR ii)Does the result hold if O is any point outside the triangle? Prove your result.

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  1. shaan_iitk
    • 4 years ago
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    Assume O to be the center ... now you have OP + OQ + OR = (OC + CP) + (OA + AQ) + (OB + BR) .. Vector addition Hence = (OC+ OA + OB) + (CP + AQ + BR) = (OC + OA + OB) + 0.5*(CB + AC + BA) Now CB + AC+ BA = 0 (it forms a triangle). Hence = OC + OA + OB.. hence proved 2) Just workout the same equation from outside the triangle to find...

  2. atjari
    • 4 years ago
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    you mean that there is no difference even the point is outside the triangle.

  3. atjari
    • 4 years ago
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    Shaan pls help

  4. shaan_iitk
    • 4 years ago
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    Yes it won't make any difference..

  5. atjari
    • 4 years ago
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    Thanx a lot.

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