Geometry and Trig

Ask your questions about all levels of geometry from elementary school through college.
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A = (4,9), B = (9,14); C divides AB in ratio 3:8. Find perp to AB thru C
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4
Views
1K
stapel
stapel
A
Finding projection of a 3D point on a plane
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1
Views
1K
HallsofIvy
H
P
Can -3sin(x)sin(2x)+2cos(x)cos(3x) be simplified any further?
Replies
9
Views
1K
MarkFL
MarkFL
shahar
understanding the graph: show when expression cos(a) + cos(b) = cos(a + b) is valid
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2
Views
903
Dr.Peterson
Dr.Peterson
shahar
if a dodecahedron is cut by a plane, what figures will I get?
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2
Views
1K
Dr.Peterson
Dr.Peterson
K
Trig identities: how does tan2x=2tanx/1-tan^2x become 2tanx and 1-tan^2x?
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2
Views
3K
Deleted member 4993
D
I
how to calculate displacement vectors?
Replies
11
Views
3K
mmm4444bot
mmm4444bot
T
help with area of triangle #1
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6
Views
1K
yma16
Y
T
help with area of triangle #2
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4
Views
1K
mmm4444bot
mmm4444bot
B
Solve for x or y with a given angle
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5
Views
1K
Beaty
B
I
Vector addition (triangle law)
Replies
9
Views
2K
mmm4444bot
mmm4444bot
shahar
Hyperpyramid
Replies
4
Views
2K
shahar
shahar
M
Similarity
Replies
12
Views
2K
Dr.Peterson
Dr.Peterson
D
Help with join angles in circle Better question
Replies
2
Views
735
lev888
lev888
I
In this case, vector a and b can make an angle?
Replies
11
Views
2K
mmm4444bot
mmm4444bot
D
Help with join angles in circle pls.
Replies
0
Views
563
Doug
D
I
Is -30 degree the same as 330 degree?
Replies
4
Views
7K
mmm4444bot
mmm4444bot
C
Geometry problem involving equalateral triangle
Replies
8
Views
2K
mmm4444bot
mmm4444bot
F
Mum needs help - Finding area given ratio
Replies
4
Views
853
sinx
S
I
If an angle 45 degree, then how to calculate the another angle?
Replies
18
Views
3K
mmm4444bot
mmm4444bot
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