Geometry and Trig

Ask your questions about all levels of geometry from elementary school through college.
shahar
theorem vs. lemma: What the difference between lemma to theorem​?
Replies
1
Views
7K
JeffM
J
C
Calculate value of E(a)=(4/5)tg(a)+(5/12)sin(2a), if cos(a) = -4/5, a ∈ (-pi; -pi/2)
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2
Views
1K
Christofor
C
M
Half-Angle Trig Identity...how can it end up in a different quadrant if angle < 90?
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3
Views
1K
mmm4444bot
mmm4444bot
M
simplify to one trigonometric expression: 2 sin (pi/4) 2 cos (pi/4)
Replies
5
Views
12K
math_knight
M
J
Convert polar form to rectangular form. (electrician studying phasors)
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1
Views
1K
Dr.Peterson
Dr.Peterson
shahar
the longest cord: It diameter is the longest cord in the circle?
Replies
2
Views
957
MarkFL
MarkFL
shahar
How can I change the angles of parallelogram to become trapezoid?
Replies
19
Views
3K
Steven G
Steven G
S
I still don't get these Qs: Imagine you have been called as a expert witness...
Replies
2
Views
1K
yma16
Y
C
MOM NEEDS HELP in geometry: solve for x if AU = 20x + 108, UB = 273, BC = 703, UV = 4
Replies
4
Views
2K
Steven G
Steven G
B
Vectors: A is at point (2,3) and B is the point (-2,0).
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2
Views
1K
Steven G
Steven G
S
A Vector + Trig Problem
Replies
1
Views
725
Dr.Peterson
Dr.Peterson
G
Geometry Test Tomorrow, Help Needed!
Replies
1
Views
891
Steven G
Steven G
M
Proving a Trig Identity
Replies
2
Views
743
mmm4444bot
mmm4444bot
I
Could you point where B cos θ and Bx in the following diagram?
Replies
3
Views
3K
mmm4444bot
mmm4444bot
M
spherical triangle formula fail
Replies
1
Views
791
Dr.Peterson
Dr.Peterson
J
Simplifying nested inverse trig function
Replies
3
Views
2K
Dr.Peterson
Dr.Peterson
R
Even rotational center of an equilateral triangle?
Replies
4
Views
2K
rg12
R
S
Trigonometry: When x+y = (2 pi)/3, x,y >= 0, then max/min of sin(a)+sin(b)=?
Replies
15
Views
6K
yma16
Y
I
Could you simplify sin(360⁰-θ)?
Replies
3
Views
2K
mmm4444bot
mmm4444bot
I
What does it mean (180⁰ - θ)?
Replies
9
Views
2K
MarkFL
MarkFL
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