Find the equation of the line for which
p = 4 and ∝ = 1800
Given: p = 4 and ∝ = 1800
Here p is the perpendicular that makes an angle ∝ with positive direction of x-axis , hence the equation of the straight line is given by:
Formula used:
x cos ∝ + y sin ∝ =p
x cos 1800 + y sin 1800 =4
i.e; cos 1800 = cos (5
360) = cos(5
2
)= cos 360 = 1
similarly, sin 1800 = sin (5
360) = sin(5
2
)= sin 360 =0
hence, x 
1+ y
0=4
Hence The required equation of the line is x=4.
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