Geometry and Trig

Ask your questions about all levels of geometry from elementary school through college.
C
Trig equation: Find all soln's of 2cos(theta)+1=0 on the interval [0,2pi)
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2
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2K
clossan88
C
W
Triangle ABC, AB=50, AC=10, area 120; D midpt of AB, E midpt of AC; angle bisector...
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3
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4K
wellskyw
W
K
Distance From a Plane To A Point, with projections help (finding distance in 3D)
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1
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1K
stapel
stapel
F
Vectors: plane speed 300mph relative to air. Wind blowing due north 30mph. What dir?
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3
Views
2K
stapel
stapel
R
How to find angle x marked in red? (bearings from Point X to pts R, S which are...)
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3
Views
2K
richiesmasher
R
M
Oil spill is 6 cubic meters, thickness is 0,002 cu meters. How many kilometers is it?
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4
Views
2K
Dr.Peterson
Dr.Peterson
R
Find missing angles In pentagon ABCDE and angle ABC=angle BCD=CDE
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10
Views
12K
richiesmasher
R
Y
Pre-U Vector Question: Line has equation r = 9i − j + 8k + λ(3i − j + 2k)
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2
Views
3K
Yoshimineb
Y
M
Special Right Trinagle: "...Clay Ave, Rt 35 are straight, perp. to each other."
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11
Views
6K
mmm4444bot
mmm4444bot
S
teacher couldn't help me understand: y'-2y=sin(x) to -sin x(B + 2A) + cos x(A-2B)=...
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9
Views
3K
Dr.Peterson
Dr.Peterson
R
Find angle of latitude: distance between P (63° N, 70°E), R (63° N, x° E) is 900km
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19
Views
4K
richiesmasher
R
W
How to find top and sides of trapezoid when all of them are equal?
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1
Views
1K
Deleted member 4993
D
J
Relationship between two planes - calculating an angle
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3
Views
2K
Dr.Peterson
Dr.Peterson
G
How to find the acceleration of a particle on a freely moving wedge
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1
Views
1K
gnits
G
T
Adding Frac Trig Fcns: Going from X2/Tan(55) + X2/Tan(75)=87120 to 5.16X2/5.329=87120
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2
Views
1K
TMcKinney
T
B
Made-up Circle Problem
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2
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2K
yma16
Y
S
X & Y proportional scale
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1
Views
1K
Dr.Peterson
Dr.Peterson
K
An 'undefined' answer with sine rule [non-right angled triangles]
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3
Views
2K
mmm4444bot
mmm4444bot
B
Trig Difference Identity: when I do sin(-15) = sin(30-45), I get a positive result
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2
Views
926
Dr.Peterson
Dr.Peterson
J
Parallel line and Triangle with missing angle
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4
Views
1K
Jim77
J
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