Geometry and Trig

Ask your questions about all levels of geometry from elementary school through college.
B
Can’t do this problem¿ (triangle: m(angle B) = 73 degrees, side b opposite is 5 units, a = 7)
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1
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1K
Dr.Peterson
Dr.Peterson
J
Trigonometric Ratios: resources that show the proof/reasoning behind the trig ratios?
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8
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1K
JeffM
J
K
How do I find the coordinates of B and D?
2
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23
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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...
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4
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930
MarkFL
MarkFL
F
Is it possible to prove the cosine addition formula with the Cosine Law and distance formula?
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2
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685
Four Muffins
F
F
I proved the cosine subtraction formula, but I don't know why it is correct
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3
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1K
Four Muffins
F
C
Find the ratio of the lengths of the chords?
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3
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2K
Dr.Peterson
Dr.Peterson
F
Can I prove sin(3t)+sin(t)=2sin(2t)cos(t) with these tools? (t=theta)
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5
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2K
Steven G
Steven G
C
Help!! "The two figures are congruent. Identify corresponding sides & angles."
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6
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2K
The Highlander
The Highlander
4
If a circle with a circumference of 16 times pi inches is circumscribed about a square, what is the length of a diagonal of the square?
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3
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1K
MathTutorPro
M
X
How can I get sinx, given 1-cos(x)-cos(y)+sin(x)cos(y)=0, 1+cos(x)-sin(y)+sin(x)sin(y)=0
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4
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2K
Dr.Peterson
Dr.Peterson
C
Calculate QRS. (Why is angle QRS = 131 degrees?)
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12
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3K
chijioke
C
C
How far is 1.5 cm chord from the center?
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5
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2K
chijioke
C
C
How find the angle subtended by a chord at the circumference of a circle
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14
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4K
chijioke
C
S
Solve the following word problem completely (Special Parallelograms)
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1
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724
mmm4444bot
mmm4444bot
M
Gauss curvature integral: Why do we have a double integral?
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12
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2K
Mondo
M
A
Counting Triangles with Polygons
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6
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2K
AvgStudent
A
T
how many feet across is my plot of land
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5
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969
stapel
stapel
F
Oprimization problem Right trapezoid (design of a building)
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5
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2K
Otis
Otis
F
How can I find length of AB and DB? (ABC is a triangle in which m(<B)=90...)
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11
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2K
The Highlander
The Highlander
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