# 5-cell

In geometry, the 5-cell is the convex 4-polytope with Schläfli symbol {3,3,3}. It is a 5-vertex four-dimensional object bounded by five tetrahedral cells. It is also known as a C5, pentachoron, pentatope, pentahedroid, or tetrahedral pyramid. It is the 4-simplex (Coxeter's polytope), the simplest possible convex 4-polytope, and is analogous to the tetrahedron in three dimensions and the triangle in two dimensions. The 5-cell is a 4-dimensional pyramid with a tetrahedral base and four tetrahedral sides. The regular 5-cell is bounded by five regular tetrahedra, and is one of the six regular convex 4-polytopes (the four-dimensional analogues of the Platonic solids). A regular 5-cell can be constructed from a regular tetrahedron by adding a fifth vertex one edge length distant from all the vertices of the tetrahedron. This cannot be done in 3-dimensional space. The regular 5-cell is a solution to the problem: Make 10 equilateral triangles, all of the same size, using 10 matchsticks, where each side of every triangle is exactly one matchstick, and none of the triangles and match sticks intersect one another. No solution exists in three dimensions. (Wikipedia).

Algebra - Ch. 5: Polynomials (1 of 32) What is a Polynomial?

Visit http://ilectureonline.com for more math and science lectures! In this video I will explain what is a polynomial. An algebraic expression with 2 or more terms. I will also explain what is a monomial, binomial, trinomial, and polynomial of 4 terms; terms, and factors. To donate: http

From playlist ALGEBRA CH 5 POLYNOMIALS

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Rational square roots, in other words, dealing with numbers that have rational numbers as their square roots. From the Algebra 1 course by Derek Owens.

From playlist Algebra 1 Chapter 11 (Selected videos)

Planning how to Solve a Probability Problem

Learn to make sense of a probability problem before grabbing the numbers. An insightful, structured approach is wise.

From playlist Unit 5 Probability A: Basic Probability

Algebra - Ch. 5: Polynomials (19 of 31) Multiplying Polynomials: Example Set #1

Visit http://ilectureonline.com for more math and science lectures! In this video I will show how to multiplying polynomials. Example Set #1 To donate: http://www.ilectureonline.com/donate https://www.patreon.com/user?u=3236071 Next video in this series can be seen at: https://youtu.be/

From playlist ALGEBRA CH 5 POLYNOMIALS

Algebra - Ch. 5: Polynomials (22 of 31) Multiplying Polynomials: Example Set #4

Visit http://ilectureonline.com for more math and science lectures! In this video I will show how to multiplying polynomials. Example Set #4 To donate: http://www.ilectureonline.com/donate https://www.patreon.com/user?u=3236071 Next video in this series can be seen at: https://youtu.be/

From playlist ALGEBRA CH 5 POLYNOMIALS

Algebra - Ch. 5: Polynomials (11 of 31) How to Multiply & Divide Monomials: Ex. 1

Visit http://ilectureonline.com for more math and science lectures! In this video I will show how to multiply and divide monomials. Example 1 To donate: http://www.ilectureonline.com/donate https://www.patreon.com/user?u=3236071 Next video in this series can be seen at: https://youtu.be

From playlist ALGEBRA CH 5 POLYNOMIALS

Algebra - Ch. 5: Polynomials (2 of 32) What is the Degree of a Polynomial?

Visit http://ilectureonline.com for more math and science lectures! In this video I will explain what are 0, 1st, 2nd, and 3rd degree polynomials. Note: the degree corresponds to the exponent of the variable in the term. To donate: http://www.ilectureonline.com/donate https://www.patreon

From playlist ALGEBRA CH 5 POLYNOMIALS

Introduction to Logarithms (2 of 2: Numerical examples)

More resources available at www.misterwootube.com

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A Tetris-Flavoured Killer Sudoku?

Simon solves this outstanding puzzle from last weekend's Sudoku Grand Prix. The puzzle was created by Zoltan Horvath.

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How to solve the Deadly Killer Sudoku: The Times 29 Dec

Simon explains how to logically solve this Deadly-rated Killer Sudoku.

From playlist Killer Sudoku guides

How to solve the Deadly-rated Killer Sudoku from The Times

Simon shows how to solve this very difficult killer puzzle from 16 Dec 2017

From playlist Killer Sudoku guides

How to solve the Deadly Killer Sudoku

Simon solves the Deadly Killer Sudoku from The Times on 9 Sept 2017

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The Power of Mathematical Visualization | The Power of a Mathematical Picture | The Great Courses

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Solving Deadly-rated Killer Sudoku: Fri 5th and Sat 6th

Simon shows how to solve the Deadly rated Killer Sudokus from The Times on Friday and Saturday. The Saturday solve is shown first. Both puzzles are very difficult this week so we hope the video is helpful.

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The \$1,000,000 Sudoku

This puzzle by Phistomefel is a million dollar masterpiece. Play it here: https://cracking-the-cryptic.web.app/sudoku/GMGqFpmqDF Rules: Normal sudoku rules apply. In addition, cells separated by exactly one knight’s move (in chess) must not contain the same digit. A number in the upper

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Killer Sudoku: Dealing with large value cages

Simon works through the deadly-rated puzzle from The Times on Friday 15 June as requested by one of our subscribers. Follow us on @crypticcracking.

From playlist Advanced Killer Sudoku Guides