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pankaj gupta Grade: 12
        

tangents PA and PB are drawn to an ellipse x^2/16+y^9=1 from the point (o,5) find the area of triangle pab

6 years ago

Answers : (3)

vikas askiitian expert
510 Points
										

X2/16+Y2/9=1  is the eq of ellipse


chord of contact = XX1/16+YY1/9=1


chord of contact = 5Y/9=1


                            Y = 9/5                     ..............1


putting Y=9/5 in the eq of ellipse then


 X = + or - 16/5


so


        A=(16/5,9/5) ,B=(-16/5,9/5) ,P=(0,5)


this triangle isoceles triangle with base AB & height of (5-9/5)units


area = (base)(height)/2


      AB(base) = 32/5 ,height = 16/5


 area = 256/25 square units


 

6 years ago
keshavbansal bansal
14 Points
										

actually i am no idea about this because till now i study only general EQ.of ellipse so please tell me a hint to solve this question

6 years ago
jagan
20 Points
										why do we substitute (0,5) in chord eqn when it does not pass through it
										
3 years ago
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