Geometry and Trig

Ask your questions about all levels of geometry from elementary school through college.
M
prove trig identity cos(2x) / [3 - sin(2x) - 4sin^2(x)] = [tan(x) + 1] / [tan(x) + 3]
Replies
8
Views
1K
MrClibert
M
E
Simple geometry problem: angle PQR = θ and angle QPR = 2θ. Prove that cos θ = p/(2q)
Replies
8
Views
2K
topsquark
topsquark
Boi
Formula of circle but with negative 2 in the exponent
Replies
8
Views
1K
Boi
Boi
B
Find the value of the pronumeral b in a kite where only one angle is given :)
Replies
2
Views
934
NotJeffM
N
B
need help
Replies
3
Views
840
Steven G
Steven G
J
2pi Radians as a complete revolution
Replies
17
Views
9K
jonah2.0
jonah2.0
J
Two Different Illustrations of Trig Ratios Tangent, Cotangent, Secant, Cosecant in terms of Unit Circle
Replies
3
Views
1K
jpanknin
J
W
MAX (X+Y) for enclose area where X, Y are positive integers but bigger or equal to 1.
Replies
12
Views
2K
Steven G
Steven G
I
Find the value of the angle x.
Replies
2
Views
710
Dr.Peterson
Dr.Peterson
K
Find a, b and c from the curve (graph) showing three points on y = a + b*sin(cx)
Replies
12
Views
2K
Steven G
Steven G
C
Calculate the radius of the circle, given 14cm chord is midway the radius
Replies
16
Views
4K
Dr.Peterson
Dr.Peterson
L
measuring intersection angle between circle and line with thickness
Replies
4
Views
1K
lathe1
L
N
Circular measure: A sector OAC subtended at O with radius 15 cm...
Replies
11
Views
2K
MarkFL
MarkFL
B
Can’t do this problem¿ (triangle: m(angle B) = 73 degrees, side b opposite is 5 units, a = 7)
Replies
1
Views
1K
Dr.Peterson
Dr.Peterson
J
Trigonometric Ratios: resources that show the proof/reasoning behind the trig ratios?
Replies
8
Views
2K
JeffM
J
K
How do I find the coordinates of B and D?
2
Replies
23
Views
3K
stapel
stapel
E
Triangles Similarity: small triangle w/ a=alpha, s1=20, s2=v; medium triangle w/ a=alpha, s=45, s=36; and...
Replies
4
Views
989
MarkFL
MarkFL
F
Is it possible to prove the cosine addition formula with the Cosine Law and distance formula?
Replies
2
Views
728
Four Muffins
F
F
I proved the cosine subtraction formula, but I don't know why it is correct
Replies
3
Views
1K
Four Muffins
F
C
Find the ratio of the lengths of the chords?
Replies
3
Views
2K
Dr.Peterson
Dr.Peterson
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