(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, ...

(i) (2,3,5) and (4,3,1) (ii) (–3,7,2) and (2,4,–1) (iii) (–1, 3, – 4) and (1, –3, 4) (iv) (2, –1, 3) and (–2, 1, 3)