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Grade 12th PassAnalytical Geometry

Find the value of k for which angle subtended by a line segment joining the points P(-1,2) and Q(1,4)at the point R(k,0) is maximum?

Profile image of ayushi dwivedi
13 Years agoGrade 12th Pass
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1 Answer

Profile image of Prajwal kr
13 Years ago

Slope of line PR= -2/(k+1)

Slope of line QR= 4/1-k

 

Angle between them must be max.

 tanα = (m1  - m2)/1+m1m2

 

           =(2k +6)/ k2 + 7

 

 

Differentiating, and putting ==0, we get k=1,7 

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