Hemi-cuboctahedron

Cuboctahedral Fractal Graph

This shows a 3d print of a mathematical sculpture I produced using shapeways.com. This model is available at http://shpws.me/17d5

From playlist 3D printing

Regular polyhedra

This shows a 3d print of a mathematical sculpture I produced using shapeways.com. This model is available at http://shpws.me/q0PF.

From playlist 3D printing

Using a set of points determine if the figure is a parallelogram using the midpoint formula

👉 Learn how to determine the figure given four points. A quadrilateral is a polygon with four sides. Some of the types of quadrilaterals are: parallelogram, square, rectangle, rhombus, kite, trapezoid, etc. Each of the types of quadrilateral has its properties. Given four points that repr

From playlist Quadrilaterals on a Coordinate Plane

What are four types of polygons

👉 Learn about polygons and how to classify them. A polygon is a plane shape bounded by a finite chain of straight lines. A polygon can be concave or convex and it can also be regular or irregular. A concave polygon is a polygon in which at least one of its interior angles is greater than 1

From playlist Classify Polygons

Bridges 2019 talk - Geared jitterbugs

This is a talk I gave with Sabetta Matsumoto at the Bridges conference on mathematics and the arts (http://bridgesmathart.org/), on 18th July 2019, about our paper: http://archive.bridgesmathart.org/2019/bridges2019-399.pdf

From playlist Talks

Thin Groups and Applications - Alex Kontorovich

Analysis and Beyond - Celebrating Jean Bourgain's Work and Impact May 21, 2016 More videos on http://video.ias.edu

From playlist Analysis and Beyond

Eleftherios Pavlides - Elastegrity Geometry of Motion - G4G13 Apr 2018

"The Chiral Icosahedral Hinge Elastegrity resulted from a Bauhaus paper folding exercise, that asks material and structure to dictate form. The key new object obtained in 1982 involved cutting slits into folded pieces of paper and weaving them into 8 irregular isosceles tetrahedra, attache

From playlist G4G13 Videos

What is the difference between convex and concave

👉 Learn about polygons and how to classify them. A polygon is a plane shape bounded by a finite chain of straight lines. A polygon can be concave or convex and it can also be regular or irregular. A concave polygon is a polygon in which at least one of its interior angles is greater than 1

From playlist Classify Polygons

Tensegrity Cuboctahedron

Cuboctahedron tensegrity consists of four interlocked triangles and 6 rubber bands. Interlocked four triangles structure is first discribed in a 1971 book by Alan Holden. Buy at http://www.shapeways.com/shops/GeometricToy Copyright (c) 2015,AkiraNishihara

From playlist 3D printed toys

What is a concave polygon

👉 Learn about polygons and how to classify them. A polygon is a plane shape bounded by a finite chain of straight lines. A polygon can be concave or convex and it can also be regular or irregular. A concave polygon is a polygon in which at least one of its interior angles is greater than 1

From playlist Classify Polygons

How to Construct a Dodecahedron

How the greeks constructed the Dodecahedron. Euclids Elements Book 13, Proposition 17. In geometry, a dodecahedron is any polyhedron with twelve flat faces. The most familiar dodecahedron is the regular dodecahedron with regular pentagons as faces, which is a Platonic solid. A regular dode

From playlist Platonic Solids

What is the difference between convex and concave polygons

👉 Learn about polygons and how to classify them. A polygon is a plane shape bounded by a finite chain of straight lines. A polygon can be concave or convex and it can also be regular or irregular. A concave polygon is a polygon in which at least one of its interior angles is greater than 1

From playlist Classify Polygons

Geometry and arithmetic of sphere packings - Alex Kontorovich

Members' Seminar Topic: Geometry and arithmetic of sphere packings Speaker: A nearly optimal lower bound on the approximate degree of AC00 Speaker:Alex Kontorovich Affiliation: Rutgers University Date: October 23, 2017 For more videos, please visit http://video.ias.edu

From playlist Mathematics

Jitterbox

The Jitterbox mechanism is due to Taneli Luotoniemi. It's an example of an auxetic material: when you pull on it, it expands in all directions. 3x3x3 Jitterbox: http://shpws.me/KRpA 4x4x4 Jitterbox: http://shpws.me/KRpE Taneli's paper model: https://www.youtube.com/watch?v=hOrOs9G2D9g

From playlist 3D printing

What are the names of different types of polygons based on the number of sides

👉 Learn about polygons and how to classify them. A polygon is a plane shape bounded by a finite chain of straight lines. A polygon can be concave or convex and it can also be regular or irregular. A concave polygon is a polygon in which at least one of its interior angles is greater than 1

From playlist Classify Polygons

Post 1462H / Hemmi 159 and a slide rule conspiracy!

I describe the interesting Post 1462H slide rule and its predecessor/successor. I present the theory that these slide rules inspired a certain model popular in Europe.

From playlist All Slide Rule Videos

Frankenrule: the Hemmi 258ab slide rule

Witness an unholy combination of slide rules: the Hemmi 259 and the Versalog II.

From playlist All Slide Rule Videos

Hemmi 260 Layout 1/2

I describe one of my favorite scale sets: the Hemmi 260 scale set.

From playlist All Slide Rule Videos

Pawn Stars: 1966 Dodge Charger with Hemi Engine (Season 14) | History

Rick takes a spin in a rare '66 Dodge Charger with a Hemi engine that might be 1 of 85 produced by NASCAR in this clip from "The Greatest Pawn on Earth!" #PawnStars Subscribe for more from Pawn Stars: http://po.st/SubscribeToPawnStars Watch more Pawn Stars on YouTube in this playlist: htt

From playlist Pawn Stars: Official Series Playlist | New Episodes Wednesdays at 8/7c | History

Determine if a set of points is a parallelogram using the distance formula

👉 Learn how to determine the figure given four points. A quadrilateral is a polygon with four sides. Some of the types of quadrilaterals are: parallelogram, square, rectangle, rhombus, kite, trapezoid, etc. Each of the types of quadrilateral has its properties. Given four points that repr

From playlist Quadrilaterals on a Coordinate Plane