The three lines with d.r’s (1,1,2), (3−1,−3−1, 4), (−3−1, 3−1, 4) forms

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An equilateral triangle

A right angled triangle

An isosceles triangle

A right angled isosceles triangle

answer is A.

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Detailed Solution

If α is the angle between (1), (2) then cosα=12⇒α=60o and β is the angle between (1),(3) then cosβ=12⇒β=600

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