Let A(3,2,0),B(5,3,2),C(−9,6,−3) are three points forming a triangle. If AD , the bisector of ∠BAC meets BC in D, then coordinates of D are
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a
−198,5716,1716
b
198,−5716,1716
c
198,5716,−1716
d
198,5716,1716
answer is D.
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Detailed Solution
A = 3,2,0 , B=( 5,3,2) , C -9,6,-3AB = 4+1+4 =3 , AC =144+16+9 =13AD = angular bisector of ∠ BAC since BD : DC = 3 :13 ⇒ D =-27+6516,18+3916'-9+2616, by section formula = 3816,5716,1716 =198,5716,1716