Thread: 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

Originally Posted by prasum

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?

but man how will i find it do i have to find the common solution of l1 and l2 it will be long

Originally Posted by prasum

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)

after finding p what we have to do

Originally Posted by prasum

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?

but how to find the angle a we have tan a= mod (m1-m2/1+m1m2)

Originally Posted by prasum

but how to find the angle a we have tan a= mod (m1-m2/1+m1m2)

Wiki answer link:

Angle - Wikipedia, the free encyclopedia

hey i dont want the meaning of angle but i want to know how to find this angle a.

Originally Posted by prasum

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