Geometry and Trig

Ask your questions about all levels of geometry from elementary school through college.
R
Euler's formula and its connection to the De Moivre's formula
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5
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1K
rtk
R
U
Combinations: A woman has 11 close friends, and wants to invite some for dinner.
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3
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4K
pka
pka
R
Can someone explain this cosine concept? "Find local max/min of y = x + 2sin(x)"
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4
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1K
mmm4444bot
mmm4444bot
J
tangent to a circle: How do I draw this from the textual description?
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3
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962
Dr.Peterson
Dr.Peterson
R
If m(RST) = 12x-1, m(RSU) = 9x-15, m(UST) = 53, find measures (all in degrees)
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4
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9K
Ryan Rigdon
R
I
Could you simplify calculation? position vector is r=(a cos(wt))i + (a sin(wt))j
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3
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2K
Dr.Peterson
Dr.Peterson
shahar
similar triangle: parabola w/ focus F, tangents at A, B meet at S
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5
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1K
yma16
Y
K
Solve triangle, given angle A=97.77 deg, incircle radius r=3.58, area S=97.48
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5
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1K
kristjan
K
S
  • Locked
A = (4,9), B = (9,14); C divides AB in ratio 3:8. Find perp to AB thru C
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4
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1K
stapel
stapel
A
Finding projection of a 3D point on a plane
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1
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1K
HallsofIvy
H
P
Can -3sin(x)sin(2x)+2cos(x)cos(3x) be simplified any further?
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9
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1K
MarkFL
MarkFL
shahar
understanding the graph: show when expression cos(a) + cos(b) = cos(a + b) is valid
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2
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859
Dr.Peterson
Dr.Peterson
shahar
if a dodecahedron is cut by a plane, what figures will I get?
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2
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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
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3K
Deleted member 4993
D
I
how to calculate displacement vectors?
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11
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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)
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9
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2K
mmm4444bot
mmm4444bot
shahar
Hyperpyramid
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4
Views
2K
shahar
shahar
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