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MHT CET202122 Sep 2021Evening ShiftMathematicsProperties of TrianglesActual

In ABC , with usual notations b B - c C ( B - C ) =

Options

  1. Ab
  2. Bc
  3. Ca
  4. Da+b+c

Correct answer

C. a

Step-by-step solution

aligned & a A = b B = c C = k & a = k A , b = k B , c = k C & b B - c C ( B - C ) = k ^2 ~B - k ^2 C ( B - C ) = k - [ ^2 ~B - ^2 C ] ^ i ( B - C ) & = k ( B - C ) ( B + C ) ( B - C ) & = k ( B + C ) k [ ( - A )]= k A = a aligned

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