Geometry and Trig

Ask your questions about all levels of geometry from elementary school through college.
T
need to prove formula for height of anti-prism
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2
Views
872
thxeveryone
T
T
Pls help ASAP how to find the distance from a vertex of a pentagon to its center knowing each side = 1
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2
Views
877
thxeveryone
T
B
Rise of an arc: 8-ft pipe, ends at A, B, center at C, ground is D. How far will C rise from D if...?
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6
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1K
Cubist
Cubist
E
Found a sine formula: a sin( (pi(180x + wp))/(180w) )
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6
Views
2K
erikthemathematician
E
R
Force Vectors: In a warehouse a box is being pulled up a ramp that has a 15 degree incline....
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4
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2K
The Highlander
The Highlander
D
Stuck on: Choose the appropriate circle for drawing a central angle of 5pi/6.
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1
Views
890
lev888
lev888
A
length of the shorter diagonal, given length of longer diagonal, lengths of sides of parallelogram
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3
Views
2K
The Highlander
The Highlander
A
Polygon with 180 degrees? (polygon has n>5 sides, int. angles form arith. seq., smallest angle 84*, common diff. 4*)
2
Replies
23
Views
5K
blamocur
blamocur
D
Unsolvable? problem. (with corrected the typo) "How many lines can you draw in a 3D space, which intersect on a single point, and none of them has..."
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7
Views
2K
Duplicity
D
O
parallelogram problem: ABCD-parallelogram, AB is perpendicular to BD, the total perimeter equals 32 cm, BD=8 cm; find area
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1
Views
932
The Highlander
The Highlander
D
Unsolvable?? problem..
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16
Views
3K
Duplicity
D
K
Please help!! ABCD is a trapezoid with bases AB and CD. Diagonals AC and BD intersect at point P and create similar triangles; AB:CD = 2:3
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6
Views
2K
Otis
Otis
K
Help quick: circle O is determined by the equation x^2 + y^2 = 3. Point P has coordinates (0, -3) Let A = (a, b) be point on circle so...
Replies
7
Views
2K
jonah2.0
jonah2.0
S
Area question involving trapezoid and parallelogram
Replies
10
Views
4K
The Highlander
The Highlander
D
Primary Trigonometric Ratios: label "opposite", "adjacent" sides; find ratios from labeled triangle
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6
Views
2K
khansaheb
K
K
Help with Math Work pls: area, perimeter of shaded portion of nested circles; arc lengths; shaded area of triangle
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3
Views
931
The Highlander
The Highlander
J
Trig identities and differentiation: I differentiated (cos(3x))^2 and got -6cos(3x)sin(3x) but answer key says -3cos(6x)
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7
Views
2K
The Highlander
The Highlander
K
Trig Grade 11 Question
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2
Views
865
katec28
K
J
Net(s) of a triangular prisms
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2
Views
2K
Dr.Peterson
Dr.Peterson
R
Home entry ramp slope
Replies
7
Views
2K
Rif
R
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