find which of the point is between the other two if the point are not collinear state so d CD,E) = b , d (E,F) = 6, dCO, f) = 4
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Answer:
Answer
The coordinates of A,B,C and D are (1,2,3),(4,5,7),(−4,3,−6) and (2,9,2) respectively.
The direction ratios of AB are (4−1)=3,(5−2)=3 and (7−3)=4
The direction ratios of CD are (2−(−4))=6,(9−3)=6 and (2−(−6))=8
It can be seen that
a
2
a
1
=
b
2
b
1
=
c
2
c
1
=
2
1
Therefore, AB is parallel to CD.
Thus, the angle between AB and CD is either 0
o
or 180
o
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