Geometry and Trig

Ask your questions about all levels of geometry from elementary school through college.
I
Sinus: Construction of Triangle (Triangles in books are sometimes only indicated with 2 lines....)
Replies
5
Views
2K
scottbrandon
S
logistic_guy
Challenge
Replies
13
Views
81K
The Highlander
The Highlander
shahar
diagonals
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6
Views
2K
shahar
shahar
A
find missing leg and sin/cos of angle
Replies
0
Views
471
alanscoot
A
A
Work Done query
2
Replies
21
Views
4K
The Highlander
The Highlander
logistic_guy
two circles
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9
Views
2K
logistic_guy
logistic_guy
G
Is pi really 3.14159...?
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0
Views
331
Gontlemang
G
logistic_guy
ambiguous
Replies
5
Views
11K
logistic_guy
logistic_guy
logistic_guy
chord in a circle
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6
Views
5K
The Highlander
The Highlander
R
Placing building in the corner of a plot of land
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1
Views
307
Raffen
R
T
wiki says eccentricity of a sliced conic section is sin(alpha)/sin(beta) without any explanation. Can someone derive this. alpha angle of cone
Replies
0
Views
266
tombrooks
T
B
Could you please tell me how I can solve these questions? I only ask that you give me guidelines to solve it, please.
Replies
0
Views
395
Berthin
B
logistic_guy
angle outside the circle
Replies
9
Views
34K
The Highlander
The Highlander
logistic_guy
external tangent
Replies
16
Views
57K
logistic_guy
logistic_guy
logistic_guy
[imath]\bold{Challenge}[/imath] - looks simple but it's very difficult
Replies
12
Views
129K
Agent Smith
Agent Smith
logistic_guy
hypothesis
Replies
3
Views
37K
logistic_guy
logistic_guy
S
What is the correct matrix for rotation about y-axis? I am seeing different sign for sine(theta) in different sources...
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5
Views
35K
blamocur
blamocur
logistic_guy
error
Replies
2
Views
43K
logistic_guy
logistic_guy
S
geometry problem
2
Replies
26
Views
83K
Aion
A
shahar
striaght lines - false/true
Replies
10
Views
61K
Dr.Peterson
Dr.Peterson
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