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Sahay Sir > Question Answers > NCERT Exemplar Class 11 > Maths > Chapter 12 - Introduction to 3D Geometry > Example 11 Show that the points A (1, 2, 3), B (–1, –2, –1), C (2, 3, 2) and D (4, 7, 6) are the vertices of a parallelogram ABCD, but it is not a rectangle.

Example 11 Show that the points A (1, 2, 3), B (–1, –2, –1), C (2, 3, 2) and D (4, 7, 6) are the vertices of a parallelogram ABCD, but it is not a rectangle.

1 2 2) and D(- 4 3% 6) are the vertices of a parallelogram ABCD 7) B(-1 but it is not a rectangle. c = 2 Example 11 Show that the points A (1