Geometry and Trig

Ask your questions about all levels of geometry from elementary school through college.
B
Did I get these trig questions right? (If P(1,-5) is on terminal arm of theta, find sec(theta).)
Replies
3
Views
1K
Steven G
Steven G
A
The Pyrthagorean Circle
Replies
2
Views
815
Ahatmose
A
T
I need to find a way to determine if a ray is pointing at a line.
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15
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2K
tetch
T
G
Euclidean Geometry Problem: Prove that (AB>AC)⟺(BD>CD)
Replies
1
Views
847
Dr.Peterson
Dr.Peterson
S
need help sketching diagram! (no answer needed) "A communication tower is 35 m tall...."
Replies
14
Views
3K
The Highlander
The Highlander
A
Inscribed circle in a triangle with known sides
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12
Views
3K
Ahatmose
A
T
Given an ellipse, determine how a cone was sliced to create it
Replies
8
Views
3K
Dr.Peterson
Dr.Peterson
S
need help drawing diagram for "A retaining wall is leaning at an angle of 70° to the horizontal...."
Replies
9
Views
2K
Dr.Peterson
Dr.Peterson
M
I need some locus geometry exercises
Replies
1
Views
844
The Highlander
The Highlander
M
Triangle: Draw three lines through a random interior point P in triangle ABC....
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11
Views
3K
MaxMontgomery
M
ALIAHMAD
what have I done wrong? "if [(sinx)^4]/2 + [(cosx)^4]/3 = 1/5 then prove that (tanx)^2=2/3"
Replies
7
Views
1K
MarkFL
MarkFL
D
Properties of bisector from trapezoid
Replies
1
Views
953
Dr.Peterson
Dr.Peterson
O
Radius required when only Chord Length is Known
Replies
15
Views
2K
Otis
Otis
C
Pipe bend circumference
Replies
3
Views
883
cjcurry
C
B
Understanding the meaing of a convention used for sinusoidal functions.
Replies
6
Views
2K
Befuddled
B
Z
Proof for the statement: "the equation ax+by+c=0 always expresses only 1 line"
Replies
3
Views
877
pka
pka
M
Is my math book wrong? sin(180° ‒ α) · sin(180° + α) ‒ cos(180° + α) · cos(180° ‒ α)
Replies
2
Views
685
Dr.Peterson
Dr.Peterson
W
Trouble understanding why two lengths are equal
Replies
3
Views
844
blamocur
blamocur
A
Sinusoidal function y = 2 sin 4 (x+ pi/8) - 2
Replies
16
Views
2K
BeachBanana
BeachBanana
M
real life applications of sin(z)=2
Replies
2
Views
923
farhan
F
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