84.Show that the points A, B and C with position vectors, respectively form the vertices of a right angled triangle, respectively form the vertices of a right angled triangle.
Let A, B, C, be the points whose position vectors are
Now,
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85.Prove that the points are the vertices of a right angled triangle.
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86.Show that the points with position vectors and are collinear.
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Short Answer Type
87.Show that the points A (2, 6, 3). B (1, 2, 7) and C (3, 10, – 1) are collinear.
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88.The position vectors of the points A, B and C are respectively. Show that A, B and C are collinear.
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89.The position vectors of the points A, B, C and D are respectively. Show that AB and CD are parallel.
Short Answer Type
what are the vectors determined by its sides? Find the length of these vectors. 
Long Answer Type
respectively. Show that A, B and C are collinear.
respectively. Show that AB and CD are parallel.
?
form the sides of right angled triangle. 
respectively form the vertices of a right angled triangle. 
Switch
are the vertices of a right angled triangle. 
and 
are collinear. 
