We are asked to find the equations of lines given their distance from the origin, $p$, and the angle, $w$, between the positive x-axis and the perpendicular line segment from the origin to the line. We are given the following problems: 1) Distance from the origin is 4 units and the angle is 60 degrees. 2) Distance from the origin is 6 units and the angle is $\frac{5\pi}{4}$. 3) $p = 2$ and $w = 30^{\circ}$. 4) $p = 5$ and $w = \frac{7\pi}{6}$.

GeometryLinesCoordinate GeometryTrigonometryDistance from a Point to a LineEquation of a Line
2025/3/31

1. Problem Description

We are asked to find the equations of lines given their distance from the origin, pp, and the angle, ww, between the positive x-axis and the perpendicular line segment from the origin to the line. We are given the following problems:
1) Distance from the origin is 4 units and the angle is 60 degrees.
2) Distance from the origin is 6 units and the angle is 5π4\frac{5\pi}{4}.
3) p=2p = 2 and w=30w = 30^{\circ}.
4) p=5p = 5 and w=7π6w = \frac{7\pi}{6}.

2. Solution Steps

The general form of the equation of a line, given its distance pp from the origin and the angle ww between the positive x-axis and the perpendicular line segment from the origin to the line, is:
xcos(w)+ysin(w)p=0x \cos(w) + y \sin(w) - p = 0
1) p=4p = 4 and w=60=π3w = 60^{\circ} = \frac{\pi}{3} radians. Then cos(60)=12\cos(60^{\circ}) = \frac{1}{2} and sin(60)=32\sin(60^{\circ}) = \frac{\sqrt{3}}{2}. Substituting into the equation gives:
xcos(60)+ysin(60)4=0x \cos(60^{\circ}) + y \sin(60^{\circ}) - 4 = 0
x12+y324=0x \frac{1}{2} + y \frac{\sqrt{3}}{2} - 4 = 0
x+y38=0x + y\sqrt{3} - 8 = 0
2) p=6p = 6 and w=5π4w = \frac{5\pi}{4}. Then cos(5π4)=22\cos(\frac{5\pi}{4}) = -\frac{\sqrt{2}}{2} and sin(5π4)=22\sin(\frac{5\pi}{4}) = -\frac{\sqrt{2}}{2}. Substituting into the equation gives:
xcos(5π4)+ysin(5π4)6=0x \cos(\frac{5\pi}{4}) + y \sin(\frac{5\pi}{4}) - 6 = 0
x(22)+y(22)6=0x(-\frac{\sqrt{2}}{2}) + y(-\frac{\sqrt{2}}{2}) - 6 = 0
2x2y12=0-\sqrt{2}x - \sqrt{2}y - 12 = 0
2x+2y+12=0\sqrt{2}x + \sqrt{2}y + 12 = 0
3) p=2p = 2 and w=30=π6w = 30^{\circ} = \frac{\pi}{6} radians. Then cos(30)=32\cos(30^{\circ}) = \frac{\sqrt{3}}{2} and sin(30)=12\sin(30^{\circ}) = \frac{1}{2}. Substituting into the equation gives:
xcos(30)+ysin(30)2=0x \cos(30^{\circ}) + y \sin(30^{\circ}) - 2 = 0
x32+y122=0x \frac{\sqrt{3}}{2} + y \frac{1}{2} - 2 = 0
3x+y4=0\sqrt{3}x + y - 4 = 0
4) p=5p = 5 and w=7π6w = \frac{7\pi}{6}. Then cos(7π6)=32\cos(\frac{7\pi}{6}) = -\frac{\sqrt{3}}{2} and sin(7π6)=12\sin(\frac{7\pi}{6}) = -\frac{1}{2}. Substituting into the equation gives:
xcos(7π6)+ysin(7π6)5=0x \cos(\frac{7\pi}{6}) + y \sin(\frac{7\pi}{6}) - 5 = 0
x(32)+y(12)5=0x(-\frac{\sqrt{3}}{2}) + y(-\frac{1}{2}) - 5 = 0
3xy10=0-\sqrt{3}x - y - 10 = 0
3x+y+10=0\sqrt{3}x + y + 10 = 0

3. Final Answer

1) x+y38=0x + y\sqrt{3} - 8 = 0
2) 2x+2y+12=0\sqrt{2}x + \sqrt{2}y + 12 = 0
3) 3x+y4=0\sqrt{3}x + y - 4 = 0
4) 3x+y+10=0\sqrt{3}x + y + 10 = 0

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