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General
Easy

Question

In Δ ABC if A = (0, 0, 4); AB = 4, BC = 3, CA = 5, I = (1, 0, 1) is the incentre and the internal bisector of straight angle straight A intersects BC at D then Dx =

  1. fraction numerator 4 over denominator 3 end fraction    
  2. fraction numerator negative 4 over denominator 3 end fraction    
  3. fraction numerator 8 over denominator 5 end fraction    
  4. 0    

The correct answer is: fraction numerator 4 over denominator 3 end fraction


    B C equals a comma C A equals b comma A B equals c rightwards double arrow A I colon I D equals left parenthesis b plus c right parenthesis colon a

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