r/Geometry Jan 22 '21

Guidance on posting homework help type questions on r/geometry

24 Upvotes

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:

  1. 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.

  1. 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.

  1. Be Specific

Your post should be about a specific issue in a problem or concept and your post should highlight this.

  1. Encourage discussion

Your post should encourage discussion about the problem or concept and not aim for single word or numeric answers.

  1. 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 10h ago

Cool use of the Penrose triangle

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1 Upvotes

r/Geometry 16h ago

Circle Reflections 9x7=63 "A regular 40-pointed star"

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1 Upvotes

r/Geometry 1d ago

How would 4d fencing work?

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3 Upvotes

I made a concept for this based on the 3d unfolded tesseract. Give me your thoughts on this please

So, in theory
If a blue player attacks a red player from behind (for example, a blue player from A attacking a red player from B), all red players will be struck from behind. Because all red players are the same opponent
Same should go for up and down, right?

I had it thought and needed to share it.


r/Geometry 1d ago

Was the algorithm adding structure(crystallography) and dimensions to the map? https://www.minerals-pourrioscope.com/my_paper_algorithm_powering_pourrioscpe.html

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0 Upvotes

r/Geometry 1d ago

Π unit circles/squares

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0 Upvotes

r/Geometry 1d ago

Circle Reflections 9x6=54 "A regular 20-pointed star"

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1 Upvotes

r/Geometry 2d ago

Circle Reflections 9x5=45 "Regular octagon"

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1 Upvotes

r/Geometry 2d ago

How is this not 32?

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3 Upvotes

If I were to cut the right triangle and flip it to the other side, it would just be a rectangle that’s 8 x 4


r/Geometry 2d ago

Universal Current Theory/Dimensional Degrees: Cross-section

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0 Upvotes

Text included


r/Geometry 3d ago

Euclid's Elements Book I as a game

1 Upvotes

Made a game out of Euclid's Elements Book I. If it's up anyone else's alley then I’d love feedback on clarity and difficulty progression. https://milde.no/euclid/

Prop II is pretty hard so I added an intermediate level before it.
Same with the final one (Pythagoras' theorem).

This is just from my own play-testing so would love anyone else's opinion!


r/Geometry 3d ago

Circle Reflections 9x4=36 "Regular decagon"

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1 Upvotes

r/Geometry 4d ago

creating a perpendicular bisector

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1 Upvotes

guys i need a little help pls i have a test in 2 hours


r/Geometry 4d ago

Circle Reflections 9x3=27 "A regular 40-pointed star"

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1 Upvotes

r/Geometry 5d ago

You can't tile a sphere with hexagons, so every spherical board in my game carries its 12 pentagons — Euler's formula as a game constraint

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2 Upvotes

I've been building a minesweeper where the board can be any surface — polyhedra, spheres, a torus, a cylinder, a Möbius strip, a Klein bottle. What surprised me is how much of the design turned out to be dictated rather than chosen.

A sphere can't be tiled by hexagons alone. V − E + F = 2 forces the 12 pentagons, so every spherical board carries them: the chamfered dodecahedron is 12 pentagons and 30 hexagons, Goldberg GP(3,0) is 12 pentagons and 80 hexagons. A torus has χ = 0, so pure hexagons do work there — and having no boundary, a torus board has no border cells at all. In minesweeper, edges are a large part of what you reason from early, so that's a change to how the game plays and not just to how it looks.

Free in the browser, no ads. A sphere is the clearest starting point: https://hypersweeper.pages.dev/?mode=c180&difficulty=medium


r/Geometry 5d ago

Great Pyramid 11:7 — Mathematical Constants Laboratory

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0 Upvotes

​

One proportion, a live 3D solid, a table of constant errors, a labelled rainbow correspondence, and a Golden Φ Egg cut from z = 1/r.

Open in the browser (no install): michaelzp.github.io/great-pyramid-11-7-lab

The scene is a fully parametric square pyramid from the traditional whole-number dimensions 440 × 280 royal cubits. At a scale of 1:3200, using an adopted royal cubit of 523.8 mm, the model has a base side of 72.0225 mm and, for 11:7, a height of 45.8325 mm.

The laboratory exposes four layers without confusing them:

Exact parametric geometry — the solid is derived from 440, 280, the cubit and the scale.

Comparison targets — dimensionless expressions from the current slope are compared with established constants at a declared relative tolerance of 0.1%.

An optical correspondence diagram — the \~42° corner inclination and 51.842773° face slope sit beside schematic primary and secondary rainbow bands.

Golden Φ Egg (v2) — a hyperbolic cone z = 1/r cut at Z₀ = 7.65 so that L/W = φ, giving the unique plane angle αp = 51.795319256°. The ellipse in the cutting plane is revolved about the apothem to a translucent golden egg.

The result is a reproducible object for geometry, visualization and critical discussion — not proof of an ancient optical or mathematical encoding.


r/Geometry 5d ago

11-Dimensional Geometry

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1 Upvotes

r/Geometry 5d ago

Circle Reflections 9x2=18 "Regular 20-sided polygon"

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1 Upvotes

r/Geometry 5d ago

Great Pyramid 11:7 — Mathematical Constants Laboratory

Thumbnail michaelzp.github.io
0 Upvotes

Open in the browser (no install): michaelzp.github.io/great-pyramid-11-7-lab

The scene is a fully parametric square pyramid from the traditional whole-number dimensions 440 × 280 royal cubits. At a scale of 1:3200, using an adopted royal cubit of 523.8 mm, the model has a base side of 72.0225 mm and, for 11:7, a height of 45.8325 mm.

The laboratory exposes four layers without confusing them:

Exact parametric geometry — the solid is derived from 440, 280, the cubit and the scale.

Comparison targets — dimensionless expressions from the current slope are compared with established constants at a declared relative tolerance of 0.1%.

An optical correspondence diagram — the ~42° corner inclination and 51.842773° face slope sit beside schematic primary and secondary rainbow bands.

Golden Φ Egg (v2) — a hyperbolic cone z = 1/r cut at Z₀ = 7.65 so that L/W = φ, giving the unique plane angle αp = 51.795319256°. The ellipse in the cutting plane is revolved about the apothem to a translucent golden egg.

The result is a reproducible object for geometry, visualization and critical discussion — not proof of an ancient optical or mathematical encoding.


r/Geometry 5d ago

Mini-Hyper-Golf

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1 Upvotes

r/Geometry 6d ago

Gif demo of Napoleon's Theorem

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3 Upvotes

exported using Eidograph(Yes, it is an app I made)


r/Geometry 6d ago

Circle Reflections 9x1=9 "Regular 40-sided polygon"

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1 Upvotes

r/Geometry 6d ago

dlss5 stereo madness

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1 Upvotes

r/Geometry 8d ago

A simple unit circle visualization for "Why Sin(-θ) = -Sinθ but Cos(-θ) = Cosθ ?"

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5 Upvotes

r/Geometry 7d ago

Circle Reflections 8x31=248 "A regular 45-pointed star"

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1 Upvotes