The problem asks us to find the equations of lines given certain conditions. First, we need to find the equation of a line given its distance from the origin and the angle the normal line makes with the x-axis (problems 1-4). Then, we are given the normal form of the line and need to write it in general form (problems 5-8).

GeometryLinesEquation of a LineTrigonometryNormal Form of a Line
2025/3/31

1. Problem Description

The problem asks us to find the equations of lines given certain conditions. First, we need to find the equation of a line given its distance from the origin and the angle the normal line makes with the x-axis (problems 1-4). Then, we are given the normal form of the line and need to write it in general form (problems 5-8).

2. Solution Steps

Problem 1:
Distance from origin p=4p = 4, angle w=60w = 60^{\circ}.
The normal form of the line is given by:
xcos(w)+ysin(w)p=0x \cos(w) + y \sin(w) - p = 0
Substituting the values:
xcos(60)+ysin(60)4=0x \cos(60^{\circ}) + y \sin(60^{\circ}) - 4 = 0
x(12)+y(32)4=0x (\frac{1}{2}) + y (\frac{\sqrt{3}}{2}) - 4 = 0
Multiplying by 2, we get:
x+3y8=0x + \sqrt{3}y - 8 = 0
Problem 2:
Distance from origin p=6p = 6, angle w=5π6w = \frac{5\pi}{6}.
The normal form of the line is given by:
xcos(w)+ysin(w)p=0x \cos(w) + y \sin(w) - p = 0
Substituting the values:
xcos(5π6)+ysin(5π6)6=0x \cos(\frac{5\pi}{6}) + y \sin(\frac{5\pi}{6}) - 6 = 0
x(32)+y(12)6=0x (-\frac{\sqrt{3}}{2}) + y (\frac{1}{2}) - 6 = 0
Multiplying by 2, we get:
3x+y12=0-\sqrt{3}x + y - 12 = 0
or
3xy+12=0\sqrt{3}x - y + 12 = 0
Problem 3:
Distance from origin p=2p = 2, angle w=30w = 30^{\circ}.
The normal form of the line is given by:
xcos(w)+ysin(w)p=0x \cos(w) + y \sin(w) - p = 0
Substituting the values:
xcos(30)+ysin(30)2=0x \cos(30^{\circ}) + y \sin(30^{\circ}) - 2 = 0
x(32)+y(12)2=0x (\frac{\sqrt{3}}{2}) + y (\frac{1}{2}) - 2 = 0
Multiplying by 2, we get:
3x+y4=0\sqrt{3}x + y - 4 = 0
Problem 4:
Distance from origin p=5p = 5, angle w=7π6w = \frac{7\pi}{6}.
The normal form of the line is given by:
xcos(w)+ysin(w)p=0x \cos(w) + y \sin(w) - p = 0
Substituting the values:
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
Multiplying by 2, we get:
3xy10=0-\sqrt{3}x - y - 10 = 0
or
3x+y+10=0\sqrt{3}x + y + 10 = 0
Problem 5:
xcos(45)ysin(45)+2=0x \cos(45^{\circ}) - y \sin(45^{\circ}) + 2 = 0
Substituting the values:
x(22)y(22)+2=0x (\frac{\sqrt{2}}{2}) - y (\frac{\sqrt{2}}{2}) + 2 = 0
Multiplying by 22\frac{2}{\sqrt{2}}, we get:
xy+22=0x - y + 2\sqrt{2} = 0
Problem 6:
xcos(225)+ysin(225)2=0x \cos(225^{\circ}) + y \sin(225^{\circ}) - \sqrt{2} = 0
Substituting the values:
x(22)+y(22)2=0x (-\frac{\sqrt{2}}{2}) + y (-\frac{\sqrt{2}}{2}) - \sqrt{2} = 0
Multiplying by 22-\frac{2}{\sqrt{2}}, we get:
x+y+2=0x + y + 2 = 0
Problem 7:
xcos(2π3)ysin(2π3)3=0x \cos(\frac{2\pi}{3}) - y \sin(\frac{2\pi}{3}) - 3 = 0
Substituting the values:
x(12)y(32)3=0x (-\frac{1}{2}) - y (\frac{\sqrt{3}}{2}) - 3 = 0
Multiplying by -2, we get:
x+3y+6=0x + \sqrt{3}y + 6 = 0
Problem 8:
xcos(5π4)ysin(5π4)+1=0x \cos(\frac{5\pi}{4}) - y \sin(\frac{5\pi}{4}) + 1 = 0
Substituting the values:
x(22)y(22)+1=0x (-\frac{\sqrt{2}}{2}) - y (-\frac{-\sqrt{2}}{2}) + 1 = 0
x(22)y(22)+1=0x (-\frac{\sqrt{2}}{2}) - y (\frac{\sqrt{2}}{2}) + 1 = 0
Multiplying by 22-\frac{2}{\sqrt{2}}, we get:
x+y2=0x + y - \sqrt{2} = 0

3. Final Answer

1) x+3y8=0x + \sqrt{3}y - 8 = 0
2) 3xy+12=0\sqrt{3}x - y + 12 = 0
3) 3x+y4=0\sqrt{3}x + y - 4 = 0
4) 3x+y+10=0\sqrt{3}x + y + 10 = 0
5) xy+22=0x - y + 2\sqrt{2} = 0
6) x+y+2=0x + y + 2 = 0
7) x+3y+6=0x + \sqrt{3}y + 6 = 0
8) x+y2=0x + y - \sqrt{2} = 0

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