Q. Verify the
following:
(i) (0, 7,
–10), (1, 6, –6) and (4, 9, –6) are the vertices of
an isosceles triangle.
(ii) (0,
7, 10), (–1, 6, 6) and (–4, 9, 6) are the vertices of a
right angled triangle.
(iii) (–1, 2, 1), (1, –2, 5), (4, –7, 8) and (2,
–3, 4) are the vertices of a parallelogram.