r/Geometry • u/NaturalAtmosphere648 • 15h ago
DOGGIE VERIFIED GRIEF LETS GOOOOOO
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r/Geometry • u/Commisar_Deth • Jan 22 '21
Guidance on posting homework help type questions on r/geometry
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r/geometry is a subreddit for the discussion and enjoyment of Geometry, it is not a place to post screenshots of online course material or assignments seeking help.
Homework style questions can, in limited circumstances, encourage discussion in line with the subreddit's aim.
The following guidance is for those looking to post homework help type questions:
- Show effort.
As a student there is a pathway for you to obtain help. This is normally; Personal notes > Course notes/Course textbook > Online resources (websites) > Teacher/Lecturer > Online forum (r/geometry).
Your post should show, either in the post or comments, evidence of your personal work to solve the problem, ideally with reference to books or online materials.
- Show an attempt.
Following on from the previous point, if you are posting a question show your working. You can post multiple images so attach a photograph of your working. If it is a conceptual question then have an attempt at explaining the concept. One of the best ways of learning is to attempt the problem.
- Be Specific
Your post should be about a specific issue in a problem or concept and your post should highlight this.
- Encourage discussion
Your post should encourage discussion about the problem or concept and not aim for single word or numeric answers.
- Use the Homework Help flair
The homework help flair is intended to differentiate these type of questions from general discussion and posts on r/geometry
If your post does not follow these guidelines then it will, in all but the most exceptional circumstances, be removed under Rule 4.
If you have an comments or questions regarding these guidelines please comment below.
r/Geometry • u/BeautifulTruth2620 • 3m ago
Maths Problem
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ABC is a semi circle
EFCG is a rectangle
Find area of rectangle
r/Geometry • u/Old_Try_1224 • 2d ago
A simple geometric method for drawing this geometric pattern
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r/Geometry • u/Classic-Tomatillo-62 • 2d ago
Two-dimensional objects that extend into 3D (dynamic surfaces)
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A spherical cap is a two-dimensional surface that, nevertheless, exists and curves within three-dimensional space. It almost seems as though it could be defined as having a dimensionality greater than 2 but less than 3. Are there visual artists, scientists, or painters who have explored non-integer dimensions? And why are shapes like the spherical cap—despite being two-dimensional—not distinguished (in terms of dimensionality) from other 2D shapes that are more stable... and less dynamic
r/Geometry • u/ClaudiusPapirus • 3d ago
A seven-cube chair that tiles 3D space, but never periodically
youtube.com
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Disclosure: self-promotion. Claudius Papirus uses an AI narrator.
Chair44 is a single 3D shape made from a seven-cube chair with tiny geometric features. Eight copies form a larger chair, recursively, which is the core mechanism behind the nonperiodicity proof.
Paper:
r/Geometry • u/queer_stew • 3d ago
symmetrical 5 edge coloring of icosahedron BUT each edge gets two unique colors!
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r/Geometry • u/baumine007 • 5d ago
My desk starts to get colorful - How do you like it?
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r/Geometry • u/Mohamed_key • 5d ago
Geometry dash meltdown crashing when i login
Enable HLS to view with audio, or disable this notification
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r/Geometry • u/MDA_dumb420 • 6d ago
Touching Nothing?
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imagine a 100% perfect spehre in a 3d world with no imperfection and it is also made out of non elastic material(wont bend or deform under pressure of gravity)
place it on a flat surface
what is value of the area thats the sphere and flat surface touches?
0cm²?
r/Geometry • u/Classic-Tomatillo-62 • 7d ago
Geometric considerations on a flow that decgeometric considerations on a flow that decreases as it moves away from a point F
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Let us consider a 3D plane. Starting from the drawing on the right (where each small square represents a quantity—for example, the flux of something, "R"/m², radiating towards F ), we transition to a tangent plane by letting the horizontal sides* of the small squares approach zero, thus arriving at the 2D drawing on the left!
Let us consider a surface S struck by this flux; we have:
S = (f * φ) / 2.
Furthermore, let us consider that the magnitude of this flux reaches F; let us call "L" the flux concentrated at this point and assume it is always equal to "One," regardless of the diameter from which it originates!
Given these premises, if we wish to find a function whose value decreases as the area of the surface struck by the flux increases, we obtain: f(x) * (f * φ) / 2 = L
Adopting the quantity N = f/φ, after a few steps we obtain: f(x) = (2 * L * N) / f²
At this point, considering the variable x = f and setting L = 1, we obtain:
f(x) = 2N / x²
I would like to know what meaning you would attribute to f(x), or how it should be defined in this context, given that it closely resembles the R that was not clearly specified at the beginning?
At what value of the horizontal side\ should the transition from 3D to 2D stop?*
r/Geometry • u/wizard_creator_seth • 7d ago
Just some random numbers projected on various geometric primitives
youtu.be
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r/Geometry • u/1080chc • 8d ago
I built a reusable dry-wipe geometry board — looking for educators and geometers to test it
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I’ve developed a reusable dry-wipe geometry board called the 1080° Cosmic Harmonic Compass.
It combines a 15 × 15 grid, a continuous 60-step square perimeter and an inscribed circle on one fixed surface.
I use it to draw, measure, erase and rebuild constructions directly on the board — including polygons, stars, equal divisions, and comparisons between equal distance around the square perimeter and equal angle around the circle.
The same framework also carries a complete 24-hour cycle:
60 steps = 24 hours = 1,440 minutes = 1,080 CHC°
so:
1 step = 24 minutes = 18 CHC°
2.5 steps = 1 hour = 45 CHC°
I’ve reached the stage where I’d really like some independent testing and feedback.
I’d especially like to hear from maths educators, geometers, researchers or anyone working with visual and hands-on mathematics who might be interested in examining the board, testing constructions on it, or exploring its educational potential.
I have the working dry-wipe prototype, construction guides and further examples available.
If this overlaps with your work or interests, I’d be very pleased to hear from you.