If A(−1,2,−3), B(5,0,−6) and C(0,4,−1) are the vertices of △ABC, then direction ratios of the external bisector of ∠BAC are
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a
−11,20,23
b
−11,20,20
c
11,20,21
d
none of these
answer is A.
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Detailed Solution
If the external bisector of ∠BAC meets BC at E, then E divides BC externally in the ratio of AB:ACWe have AB=7, AC=3. Coordinates of E are −154,7,114∴ The direction ratio of line AE are −154+1,7−2,114+3=−114,5,234 = -11,20,23