Q20 of 59 Page 178

P1, P2 are points on either of the two lines at a distance of 5 units from their point of intersection. Find the coordinates of the foot of perpendiculars drawn from P1, P2 on the bisector of the angle between the given lines.

Given lines are y - √3|x| = 2

If x ≥ 0, then


y - √3x = 2 …(i)


If x < 0, then


y + √3x = 2 …(ii)


On adding eq. (i) and (ii), we get


y - √3x + y + √3x = 2 + 2


2y = 4


y = 2


Putting the value of y = 2 in eq. (ii), we get


2 + √3x = 2


√3x = 2 – 2


x = 0


Point of intersection of given lines is (0, 2)


Now, we find the slopes of given lines.


Slope of eq. (i) is


y = √3x + 2


Comparing the above equation with y = mx + b, we get


m = √3


and we know that, m = tan θ


tan θ = √3


θ = 60° [ tan 60° = √3]


Slope of eq. (ii) is


y = - √3x + 2


Comparing the above equation with y = mx + b, we get


m = -√3


and we know that, m = tan θ


tan θ = -√3


θ = (180° - 60°)


θ = 120°



In ΔACB,



[given: AC = 5units]



OB = OA + AB



Hence, the coordinates of the foot of perpendicular =


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