Questions
If and are direction ratios of two lines, then the angle between them is
detailed solution
Correct option is A
If θ is the acute angle between two lines having direction ratios a1,b1,c1and a2,b2,c2 then cosθ=a1a2+b1b2+c1c2a12+b12+c12⋅a22+b22+c22Hence,cosθ=2+3+51+1+1⋅4+9+25=103⋅38=5257Therefore,θ=cos−15257Talk to our academic expert!
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Angle between the lines whose direction ratios are a,b,c and is
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