Geometry and Trig

Ask your questions about all levels of geometry from elementary school through college.
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How to solve for a in r = xsin(a) + ysin(a+b) + zsin(a+b+c); x,y,z,b,c are constant?
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1
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679
sinx
S
G
In Triangle ABC, internal bisector of ∠ABC, external bisector of ∠ACB meet at P.
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6
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2K
Dr.Peterson
Dr.Peterson
A
Question: Two equation of two unknown angles (Hint: cos^2(theta_4)+sin^2(theta_4)=1)
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6
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2K
Deleted member 4993
D
S
Trig: Show cos(x) + cos(x + θ) = A cos(x + φ), where φ = θ/2 and A = 2 cos(θ/2)
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1
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723
Dr.Peterson
Dr.Peterson
D
Finding unknown value: rt triangle w/ pts (x, x + 1), (x + 2, x + 3), (x + 3, 2x + 4)
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9
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1K
Dr.Peterson
Dr.Peterson
C
Skew lines in box
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3
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1K
stapel
stapel
D
Find angle B in circle. Angle B rests on inner side of outer line of circle.
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6
Views
2K
DrGore
D
T
mysterious area problem
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3
Views
1K
Dr.Peterson
Dr.Peterson
E
Trigonometry...I think (angles of depression, lengths of 1 side each)
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2
Views
749
stapel
stapel
N
Geometry Trouble: Solve triangle using technique in model
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6
Views
2K
stapel
stapel
R
tangent-secant-theorem, chord-theorem, angle?
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3
Views
1K
robmma82
R
T
Chord length of a circle using arc lenght?
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2
Views
2K
tomadom
T
N
Yards, area, squaring: perimeter set up around crime scene that spans 3 city blocks
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4
Views
3K
No Name
N
S
Find a point on an ellipse given major and minor axis
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8
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2K
sabooru
S
R
I'm trying to remember the formula for a semi-circle using sin and cos.
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6
Views
4K
ronhollenbeck
R
D
Find angle DFE. Probably using inscribed angles, circle, chords, arcs.
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8
Views
3K
Dr.Peterson
Dr.Peterson
S
Help w/ exponential: H(w) = (1/2)(1 - e^{-jw}) = sin(w/2) e^{-jw/2} e^{j pi / 2}
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8
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4K
superbrew
S
D
Trigonometry Proof: For the sharp angles a and b is: sin (a + b) < sin a + sin b
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2
Views
971
JeffM
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J
Finding Gradient slope: Elev. A = 200.05, Elev. B = 325.25, hor. dist. 1625'; find %
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1
Views
921
Deleted member 4993
D
L
Finding measures
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3
Views
875
yma16
Y
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