Geometry and Trig

Ask your questions about all levels of geometry from elementary school through college.
K
trigonometric identities: cos2x=cos^2x-sin^2x... now, why is cos^2x-sin^2x is used?
Replies
3
Views
6K
ken_165
K
K
double angle identities: sin2x=2sinxcosx=2sinxcosx/cosxsec^2x•cosxsec^2x
Replies
3
Views
1K
ken_165
K
O
Considering the problem of putting n points in the surface of a sphere.
Replies
2
Views
1K
Dr.Peterson
Dr.Peterson
J
Help. Circle/Triangle Geometry: Show OMP' is similar to OMP
Replies
6
Views
1K
John1234
J
J
Surface of paraboloid
Replies
2
Views
1K
yma16
Y
Y
Prove DE//BC, given mBD=mDC, F is on median AD, Lines CD, BE meet AD at F.
Replies
6
Views
2K
Dr.Peterson
Dr.Peterson
S
Need to calculate the length of an arc: 16' wide at base, rises 12" in center
Replies
2
Views
2K
Dr.Peterson
Dr.Peterson
L
Triangle geometry: Let △ABC be a triangle. Let AD and CE be its internal bisectors, w
Replies
2
Views
3K
Lemoine
L
M
Find the Sizes of these Angles (5 Q's w/ parallel lines, transversals, etc)
Replies
3
Views
973
Deleted member 4993
D
A
Ramanujan Notebook: rt triangle ABC in which two arcs of circles are centred at A & C
Replies
2
Views
1K
apple2357
A
O
Tangent and Right Triangle
Replies
4
Views
1K
orecchionebruno
O
R
Arc length between two points on a cylindrical shell
Replies
9
Views
6K
rww88
R
H
Given in circle b, measure of arc DCA = 316, find m<ACD
Replies
12
Views
4K
Dr.Peterson
Dr.Peterson
A
rectangle length 2X width, area equal to that of square w/ 12cm sides
Replies
7
Views
2K
anibal.antonio
A
M
Trigonometric-Identity Problem (Quick Question)
Replies
1
Views
859
HallsofIvy
H
B
conical tank - radius of cone of water always porportional of height?
Replies
2
Views
2K
Barry75
B
H
Prove ABC is Isoceles, given BE = BD and AE = CD
Replies
1
Views
1K
Steven G
Steven G
T
Distance from Chord to Circle Edge?
Replies
3
Views
3K
tomadom
T
H
Find the value of x if AB = 38 and CD = 68. Figure may not be drawn to scale.
Replies
5
Views
2K
happiness
H
H
Refer to the figure. Choose correct similarity statement
Replies
3
Views
2K
happiness
H
You must log in or register to post here.
Top