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Math Help - coordinate geometry problem

  1. #1
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    coordinate geometry problem

    line l1=ax+by+c=0 and line l2=lx+my+n=0 intersect at point p and make angle a with each other find the equation of line different from l2 which passes through p and makes the same angle a with l1=ax+by+c=0

    please help
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  2. #2
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    Quote Originally Posted by prasum View Post
    line l1=ax+by+c=0 and line l2=lx+my+n=0 intersect at point p and make angle a with each other find the equation of line different from l2 which passes through p and makes the same angle a with l1=ax+by+c=0

    please help
    First have you figured out what point p is?
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  3. #3
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    but man how will i find it do i have to find the common solution of l1 and l2 it will be long
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  4. #4
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    Quote Originally Posted by prasum View Post
    but man how will i find it do i have to find the common solution of l1 and l2 it will be long
    Do you have your math notes or a textbook which explains how to find that point p? (not long at all - this is basic math)
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  5. #5
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    after finding p what we have to do
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  6. #6
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    Quote Originally Posted by prasum View Post
    after finding p what we have to do
    The next step is to find that angle a that the two starting lines make. Then the final step is to find another line passing through point p which makes the same angle a with either of the two starting lines.

    How far did you get with this problem? Have you made an attempt to solve it?
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  7. #7
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    but how to find the angle a we have tan a= mod (m1-m2/1+m1m2)
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  8. #8
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    Quote Originally Posted by prasum View Post
    but how to find the angle a we have tan a= mod (m1-m2/1+m1m2)
    Wiki answer link:

    Angle - Wikipedia, the free encyclopedia
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  9. #9
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    hey i dont want the meaning of angle but i want to know how to find this angle a.
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  10. #10
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    coordinate geometry problem

    Quote Originally Posted by prasum View Post
    hey i dont want the meaning of angle but i want to know how to find this angle a.
    Hi prasum,
    Why dont you show the three equations you have and what you have done. Someone will help you with this info.

    bjh
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