Magic shapes | Recreational mathematics

Hexagonal tortoise problem

The hexagonal tortoise problem (Korean: 지수귀문도; Hanja: 地數龜文圖; RR: jisugwimundo) was invented by Korean aristocrat and mathematician Choi Seok-jeong, who lived from 1646 to 1715. It is a mathematical problem that involves a hexagonal lattice, like the hexagonal pattern on some tortoises' shells, to the (N) vertices of which must be assigned integers (from 1 to N) in such a way that the sum of all integers at the vertices of each hexagon is the same. The problem has apparent similarities to a magic square although it is a vertex-magic format rather than an edge-magic form or the more typical rows-of-cells form. His book, Gusuryak, contains many mathematical discoveries. (Wikipedia).

Hexagonal tortoise problem
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Square and Regular Hexagon Action: Challenge Problem

Link: https://www.geogebra.org/m/dxsNFYWQ

From playlist Geometry: Challenge Problems

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From playlist Civilization

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Hexagons appear all over the natural world from honeycomb to bubbles, and they even appear in organic chemistry! In this episode of Crash Course Organic Chemistry, we're learning all about cyclohexanes, including how rings pucker to relieve strain, the boat and chair conformations, and how

From playlist Organic Chemistry

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From playlist Evaluate Inverse Trigonometric Functions

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Mladen Bestvina, Lecture 1: PL Morse Theory Part I

26th Workshop in Geometric Topology, University of Wisconsin-Milwaukee

From playlist Mladen Bestvina: 26th Workshop in Geometric Topology

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The World Used To Be Full of Giant Tortoises

The world used to be full of giant tortoises, and the ones that live on the Seychelles and Galápagos islands are all we have left. But how did these big reptiles get to the islands in the first place? And why is turtle anatomy so weird? Subscribe to the pin club here: https://store.dftba.

From playlist Turtles

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From playlist Concerning Education

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👉 Learn how to solve the word problems with trigonometry. Word problems involving angles, including but not limited to: bearings, angle of elevations and depressions, triangles problems etc are solved using trigonometry. To be able to solve these problems it is important that you have a gr

From playlist Evaluate Inverse Trigonometric Functions

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Word Problems with trigonometry and triangles

👉 Learn how to solve the word problems with trigonometry. Word problems involving angles, including but not limited to: bearings, angle of elevations and depressions, triangles problems etc are solved using trigonometry. To be able to solve these problems it is important that you have a gr

From playlist Evaluate Inverse Trigonometric Functions

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Word Problems with trigonometry and triangles

👉 Learn how to solve the word problems with trigonometry. Word problems involving angles, including but not limited to: bearings, angle of elevations and depressions, triangles problems etc are solved using trigonometry. To be able to solve these problems it is important that you have a gr

From playlist Evaluate Inverse Trigonometric Functions

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Word Problems with trigonometry and triangles

👉 Learn how to solve the word problems with trigonometry. Word problems involving angles, including but not limited to: bearings, angle of elevations and depressions, triangles problems etc are solved using trigonometry. To be able to solve these problems it is important that you have a gr

From playlist Evaluate Inverse Trigonometric Functions

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6 Ways Species Rely on Humans for Survival

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From playlist Biology

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Preface | MIT Calculus Revisited: Single Variable Calculus

Preface Instructor: Herb Gross View the complete course: http://ocw.mit.edu/RES18-006F10 License: Creative Commons BY-NC-SA More information at http://ocw.mit.edu/terms More courses at http://ocw.mit.edu

From playlist MIT Calculus Revisited: Single Variable Calculus

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Infinite Series - Numberphile

Fields Medallist Charlie Fefferman talks about some classic infinite series. More links & stuff in full description below ↓↓↓ Charles Fefferman at Princeton: https://www.math.princeton.edu/people/charles-fefferman Numberphile is supported by the Mathematical Sciences Research Institute

From playlist Infinity on Numberphile

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How to solve a trigonometric equation

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From playlist Solve Trigonometric Equations

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Zeno's Paradox - Numberphile

Dr James Grime is back and talking about tortoises. More links & stuff in full description below ↓↓↓ In many ways this video follows on from http://www.youtube.com/watch?v=bFNjA9LOPsg and then http://www.youtube.com/watch?v=CMP9a2J4Bqw James Grime's website is: http://singingbanana.com

From playlist James Grime on Numberphile

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Magic square | Vertex (geometry)