Mathematics · Three Dimensional Geometry
The lines x = ay + b, z = cy + d and x = αy + β, z = γy + δ are perpendicular, if:
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- 1aα + cγ + 1 = 0✓
- 2aα + bβ + 1 = 0
- 3bβ + cγ + 1 = 0
- 4aα + bβ + cγ + 1 = 0
Correct answer
aα + cγ + 1 = 0
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