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the position o the vectors A,B,C of a triangle are i-j-3k, 2i+j-2k and -5i+2j-6k respectively.the length of the bisector AD of the angle BAC where D is on the line segment BC,is 1-15/2 2-¼ 3-11/2 4-none

the position o the vectors A,B,C of a triangle are i-j-3k, 2i+j-2k and -5i+2j-6k respectively.the length of the bisector AD of the angle BAC where D is on the line segment BC,is 
1-15/2  2-¼  3-11/2  4-none

Grade:12

2 Answers

abhishek singh
40 Points
9 years ago
see as AD is internal bisector o angle BAC , it ( that is the point D ) will divide  BD and DC in the ratio of AB/AC i.e 1:3 . now using the division formula get the cordinate of D . and find the magnitude of AD.. and    i am getting the answer (3/4)*101/2  . i.e none of these
abhishek singh
40 Points
9 years ago
if this is not the answer then please post the solution .. 
 
 
 but   think this is a correct approach

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