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in Three-dimensional geometry by (36.3k points)

From a point P(λ, λ, λ), perpendiculars PQ and PR are drawn respectively on the lines y = x, z = 1 and y = – x, z = –1. If P is such that ∠QPR is a right angle, the possible value(s) of λ is(are) 

(a) √2

(b) 1

(c) –1

(d) –√2 

1 Answer

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by (33.0k points)
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Best answer

Answer is (c) -1

For λ = 1, the point P and Q are consider

Hence, the value of λ = – 1. 

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