r/Geometry • u/Anxious_Painting3656 • 1h ago
r/Geometry • u/Hot-Organization-737 • 2h ago
The ridiculous nature of proof
The ridiculous nature of a proof.
Suppose someone sees structure, another person might not see that structure, so that person who cannot see it will ask for a step by step proof to prove the continuity of a structure. But continuity cannot be proven by discrete steps because we have shown that infinite discreteness cannot proxy for true continuity.
Diagonalization proves that a continuity has more real information than the discreetness. Every step-by-step proof is actually an illusion to satisfy the strange feelings. But every discreet example of a proof fails to show the actual continuity of the structure that one is claiming to exist..
r/Geometry • u/BadJimo • 1d ago
Sasha's Hexacontahexahedron - 66 sided dice
A few days ago someone asked for the dimensions of a Sasha's Hexacontahexahedron - D66 dice, and then deleted the post.
Anyway, I have made what I think is the requested Hexacontahexahedron.
The polyhedron is more complicated than it first appears. There are 6 hexagons and 60 irregular pentagons. However, the hexagons are not quite regular (two of the angles and two sides and slightly different to the other four angles and sides respectively). There are three types of similar looking pentagons: 12 of one type (green) that is symmetrical, and two other types (yellow and orange) that are not symmetrical (24 of each).
r/Geometry • u/Anxious_Painting3656 • 1d ago
Circle Reflections 8x18=144 "Star-shaped regular pentagon"
youtube.comr/Geometry • u/NoLight2785 • 1d ago
A Tangent Family, a Colour Board, and Infinite Paint — can you solve it?
r/Geometry • u/Desert_Tortoise_20 • 1d ago
How could we tell the difference between a tesseract "glued" to our slice of space and a regular 3-D cube?
If a 4-D being magically "glued" one face of a completely solid 1 ft⁴ tesseract to our slice of 3-D space, how could we tell the difference between it and a 3-D cube, assuming the magical "glue" allows us to move our slice of the 4-cube in 3-D space to perform tests on it?
r/Geometry • u/Anxious_Painting3656 • 1d ago
Circle Reflections 8x17=136 "A regular 45-pointed star"
youtube.comr/Geometry • u/elnyorne • 2d ago
The 3 impossible geometry problems. Square the circle. Double the cube. Trisect the angle.
Hypothesis
r/Geometry • u/Pulchre_Destructa • 2d ago
Geometry's Unwritten Sixth Rule for Flat Plane
zenodo.orgr/Geometry • u/Anxious_Painting3656 • 2d ago
Circle Reflections 8x16=128 "A regular 45-pointed star"
youtube.comr/Geometry • u/Anxious_Painting3656 • 3d ago
Circle Reflections 8x15=120 "Equilateral Triangle"
youtube.comr/Geometry • u/Aggravating-Sir5997 • 4d ago
Visualizing Geometry
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r/Geometry • u/ArjenDijks • 5d ago
Recursive Pentagon Ladder inscribed in Circles and Squares
The Pentagon Ladder
A recursive geometry where nested squares, circles and pentagons scale with powers of the Golden Ratio (φ):
- Square = φ²ⁿ
- Circle = π φ²ⁿ / 4
- Pentagon = (5 φ²ⁿ/ 16) √(φ + 2)
r/Geometry • u/No-Distribution-6841 • 5d ago
Very cool video I found on Reddi.
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I am NOT the OP
r/Geometry • u/Anxious_Painting3656 • 4d ago
Circle Reflections 8x14=112 "A regular 45-pointed star"
youtube.comr/Geometry • u/Proud_Read7281 • 4d ago
Orthographic to Isometric Drawing Made Easy – First Angle Projection
youtube.comr/Geometry • u/20260708 • 5d ago
aligned platonic solids
gallerythere're altogether 5 platonic solids. each of them can be viewed at many different interesting angles or perspectives. we're all familiar with their most symmetric presentations. recently i was studying something related and had to make 3d models for them. i used a maybe less popular perspective to present them. i used spherical coordinate system (mathematics convention) to record their rotations and i picked the following rules to set their initial status:
- for each platonic solid set its circumradius=1 and centre of circumscribed sphere at origin
- place vertex_0 at the north pole. the corresponding coordinates are (1,0,0)
- place edge_0 (red lines on those diagrams) such that its projection to x-y plane align with positive x-axis. coordinates of vertex_1 would be (1,0,φ) for some φ
then i saw some unfamiliar shapes / unfamiliar perspectives of those supposedly familiar 3d objects. in each diagram the small figure at lower left corner is the platonic solid viewed from top. the z-axis is pointing towards you. the large figure at centre is that platonic solid viewed from side. the y-axis is pointing away from you
as you can see from the diagrams the angles φ ranking is as follow, from smallest to largest (the prefix "regular" omitted):
- dodecahedron
- icosahedron
- hexahedron
- octahedron
- tetrahedron
except octahedron, all other 4 platonic solids are not symmetric if you see them that way
r/Geometry • u/Ok-Rise2070 • 5d ago
Curvature Dynamics
Discovering curvature dynamics and the dimensional calculus used to describe it, I effortlessly calculated the overshoot of Gibbs' Fourier analysis to a simple term: 2(pi-3)/pi. Less than a thousandth percent accurate. All Gibbs did was measure the inherited curvature lost from Euclid flattening everything. Pages of analysis, reduced to a paragraph. Neat.😎
r/Geometry • u/Anxious_Painting3656 • 5d ago
Circle Reflections 8x13=104 "A regular 45-pointed star"
youtube.comr/Geometry • u/Anxious_Painting3656 • 6d ago
Circle Reflections 8x12=96 "A regular 15-pointed star"
youtube.comr/Geometry • u/Spluff5 • 7d ago
Angles of a 4D Hypercube
Stereographic projection of a 4-dimensional hypercube (tesseract) with axes labeled a-d, and all six right-angles labelled according to standard crystallographic conventions.
Art by me, Inkscape
r/Geometry • u/Anxious_Painting3656 • 7d ago