Geometry and Trig

Ask your questions about all levels of geometry from elementary school through college.
F
Triangle congruence
Replies
2
Views
1K
Nessittere
N
D
Name the postulate or theorem you can use to prove two triangles are equal.
Replies
9
Views
5K
Steven G
Steven G
D
Suppose line A equals line B and line C equals line D. Can you use the SSS Postulate.
Replies
7
Views
2K
DrGore
D
E
Prove that one trig function equals another (too lengthy to include in title)
Replies
5
Views
989
yma16
Y
M
Use trigonometric identities to verify each identity: cot(A/2) - tan(A/2) = 2cotA and
Replies
1
Views
950
stapel
stapel
S
double compound formulae and other bits: If θ is fixed real number w/ 0≤θ<2π, show...
Replies
2
Views
826
stapel
stapel
A
Find A: If SinA = 2Cos^2A, find A.
Replies
2
Views
1K
AA.R
A
C
See Saw Equation
Replies
1
Views
971
CPerry
C
G
Sound localisation using multilateration?
Replies
2
Views
1K
Dr.Peterson
Dr.Peterson
B
Determining the relative coords of a 3D point from one coordinating system to another
Replies
1
Views
1K
lev888
lev888
N
Question about angles & vectors: So if I say something move 15 degrees...?
Replies
2
Views
1K
Steven G
Steven G
S
How to calculate the distance from center to sides.
Replies
2
Views
1K
yma16
Y
D
Help finding the diameter of a sphere based on a small section
Replies
2
Views
1K
dibble
D
W
How to find angle beta in drawing, given BAC is right, AB = AC, BC = CD
Replies
1
Views
946
Dr.Peterson
Dr.Peterson
E
Elliptical frustum's height? Vol. is V=(1/3)*pi*{(a*b)*(bh/b-d) - (c*d)*[(bh/b-d)-h]}
Replies
6
Views
2K
eimimitu
E
P
Pyramids: two perpendicular lateral face and are equilateral triangle
Replies
3
Views
3K
Dr.Peterson
Dr.Peterson
C
need some help with trig function: 4 sin(a + pi/6) cos(a - pi/6)
Replies
3
Views
2K
stapel
stapel
S
Trig: A triangle has a side of length 1, a side of length 4 and an angle of 30◦
Replies
2
Views
2K
Dr.Peterson
Dr.Peterson
H
Find all angles
Replies
19
Views
6K
happiness
H
S
Need help with 2 questions: area of pond, gallons of water; number of truck-loads
Replies
3
Views
2K
stapel
stapel
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