Geometry and Trig

Ask your questions about all levels of geometry from elementary school through college.
M
Urgent Help Please: "The math club designed a pennant for the school team, in the shape of an isosceles triangle."
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3
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3K
The Highlander
The Highlander
M
finding r3 in terms of r1 and r2: circles, C1 and C2, C1 larger than C2; C1 tangent to C2, y-axis, and x-axis; C2 tangent to C1 and x-axis
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19
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5K
mario99
M
T
Maximize an angle by finding a point's coordinates
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2
Views
866
Dr.Peterson
Dr.Peterson
A
Show that the angles ACB and DCF are equal
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0
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1K
anonym4=
A
B
Finding the length of a curved line between two points
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9
Views
3K
blamocur
blamocur
A
Follow-up to: About how many m^2 of steel will Marcel need to build the pool?
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1
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827
stapel
stapel
S
I need your help: If AT+BT' = m√n-p√q, m,n,p,q natural, n^2, q^2 coprime, find mn-pq.
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10
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2K
Seyed
S
M
Finding Segments and Angles: Given AE, BDG, angle F, angle G are right angles; D is midpoint of EC, B is midpoint of...
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2
Views
900
Dr.Peterson
Dr.Peterson
I
Distance between 2 vectors: If I want to define (and later measure) this, how is that commonly done?
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2
Views
812
khansaheb
K
L
My proof on 5 color map
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6
Views
1K
blamocur
blamocur
bob thompson
Mathematical Prison Escape: Create challenge where prisoner has to use geo/trig to escape
2
Replies
25
Views
5K
bob thompson
bob thompson
J
The packing problem: What is the methodology for finding how many small spheres (radius r) can fit in a large sphere (radius R)?
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1
Views
2K
Dr.Peterson
Dr.Peterson
rocketFrog
Need help with a triangle similarity problem: Triangle CBD is inscribed in a circle. From point D, a tangent line is drawn...
Replies
1
Views
862
Dr.Peterson
Dr.Peterson
V
right scalene triangle problem with two right triangles in it help
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7
Views
2K
khansaheb
K
R
Circle over a rectangle - radius needed (opening is 60" vertical x 25" horizontal; strut is 2.5" wide)
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4
Views
1K
Dr.Peterson
Dr.Peterson
D
Semicircle Right Angled Trig: In the diagram, O is the centre of semicircle ACB, and...
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3
Views
1K
The Highlander
The Highlander
S
Vectors question: Prove that XYZ is a straight line
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3
Views
2K
blamocur
blamocur
S
Vectors question: OACB is a trapezium whose diagonals, OC and AB, intersect at P.
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3
Views
4K
blamocur
blamocur
S
Length of ladder: A ladder leans against a wall with its base 15 ft from it. When the ladder is pulled 5 ft further from the wall...
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4
Views
3K
The Highlander
The Highlander
L
The third harmonic of a wave motion is given by:4.3cos3θ-6.9sin3θ. express this in the form R sin(3θ±α) .
Replies
3
Views
1K
The Highlander
The Highlander
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