Geometry and Trig

Ask your questions about all levels of geometry from elementary school through college.
A
Straight line problem: line through (-5,-4) meets x+3y+2=0, 2x+y+4=0, x-y-5=0 at B,C,D respectively. If (15/AB)^2+(10/AC)^2=(6/AD)^2, find line's eqn.
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11
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1K
khansaheb
K
R
Trigonometry: The diagram shows a rectangle ABCD inside a semicircle, centre O and radius 5cm, such that |<BOA| = |COD| = theta degrees
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9
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2K
The Highlander
The Highlander
A
Volume of triangular prism: The area of a triangular prism is 1/2*base*height*length but why did they add a sin(60)?
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8
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2K
annaanna
A
T
A regular polygon is formed by a complex equation’s solutions.
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5
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1K
blamocur
blamocur
R
Co-ordinate Geometry: Verify that 3x - y - 4 = 0 contains pt (2, 2). Hence find shortest distance between line and 6x - 2y + 7 = 0
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3
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1K
The Highlander
The Highlander
A
Circle Geometry Question: quadrilateral inscribed in circle; some angle measures given
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2
Views
806
Dr.Peterson
Dr.Peterson
R
3D projection matrix: Why isn't my 'simple' matrix enough, and what exactly does this real matrix do (better) relative to my matrix?
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0
Views
627
RMalachi
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G
Help with a high school problem involving some analytical geometry and derivation
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3
Views
902
The Highlander
The Highlander
B
I'm having trouble with Sum and Difference identity problems like one in the photo and I am unsure of how to go about solving it.
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1
Views
630
Dr.Peterson
Dr.Peterson
A
Please help with this: In triangle XYZ, side y is 8cm, side z is 5cm, and the measure of angle Y is 75 deg; find the length of side x
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6
Views
1K
Dr.Peterson
Dr.Peterson
N
Please help: On an athletic field, the length of one running track is exactly 400 meters. What is the distance between the front and back lines?
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2
Views
856
The Highlander
The Highlander
J
Compartive Pie Chart Question B: Work out the number of packs of vegan sausages that were sold in May 2019
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1
Views
710
Dr.Peterson
Dr.Peterson
S
help determining co-ordinates of offset points on a curve: need to find y dimension between flat horizontal and curved profile
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1
Views
823
Dr.Peterson
Dr.Peterson
A
Help w/: How to find height, width and height from sidefaces on box in shape of rectangular prism
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2
Views
928
Dr.Peterson
Dr.Peterson
N
Please help: "The base of the pyramid is a square with a side length of 2√3, and the height of the pyramid is 3cm, with its apex..."
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7
Views
2K
Leonie17
L
Y
Area of plane figures: Find the angle of a sector whose arc length s 22cm and the area is 44cm
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4
Views
1K
The Highlander
The Highlander
J
Find the value of x-y of the given shape ("In the diagram, CD = CE = 30 and F is the midpoint of CE....")
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4
Views
1K
John Ode
J
L
Please explain me to understand solution: A ship starts at point A and sails 5 km on a bearing of 135 degrees to point B.
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2
Views
790
eipi45
E
M
Trying to find Sylvester's triangle problem proof
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0
Views
793
MathNugget
M
L
Cuboid volume: Cuboid 8x9x9 has cuboid 3x6x6 cut out of it.
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10
Views
2K
khansaheb
K
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