Amazing Math: Introduction to Platonic Solids by Sunil Tanna PDF

By Sunil Tanna

ISBN-10: 150308485X

ISBN-13: 9781503084858

This booklet is a consultant to the five Platonic solids (regular tetrahedron, dice, normal octahedron, commonplace dodecahedron, and usual icosahedron). those solids are very important in arithmetic, in nature, and are the one five convex standard polyhedra that exist.

issues coated comprise:

  • What the Platonic solids are
  • The historical past of the invention of Platonic solids
  • The universal beneficial properties of all Platonic solids
  • The geometrical information of every Platonic stable
  • Examples of the place each one kind of Platonic strong happens in nature
  • How we all know there are just 5 forms of Platonic reliable (geometric facts)
  • A topological facts that there are just 5 kinds of Platonic reliable
  • What are twin polyhedrons
  • What is the twin polyhedron for every of the Platonic solids
  • The relationships among each one Platonic reliable and its twin polyhedron
  • How to calculate angles in Platonic solids utilizing trigonometric formulae
  • The dating among spheres and Platonic solids
  • How to calculate the outside zone of a Platonic reliable
  • How to calculate the amount of a Platonic good

additionally integrated is a quick creation to a couple different attention-grabbing sorts of polyhedra – prisms, antiprisms, Kepler-Poinsot polyhedra, Archimedean solids, Catalan solids, Johnson solids, and deltahedra.

a few familiarity with simple trigonometry and intensely simple algebra (high institution point) will let you get the main out of this e-book - yet that allows you to make this e-book obtainable to as many folks as attainable, it does comprise a short recap on a few worthy easy ideas from trigonometry.

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Additional resources for Amazing Math: Introduction to Platonic Solids

Sample text

We can therefore reach this inequality: Additionally, we know that p and q must both be positive integers (whole numbers) greater than or equal to 3. By a simple process of trying out different values of p and q, we can quickly see there are only 5 possibilities for (p, q) – namely (3, 3), (3, 4), (3, 5), (4, 3), (5, 3), which of course correspond to the 5 Platonic solids, and their Schläfli symbols. I have reproduced the table of Platonic solids with their Schläfli symbols here: Dual Polyhedra Every type of polyhedron has an associated dual polyhedron (also known as a "polar polyhedron") which is made by putting the center of face where each vertex was, and a vertex where the center of each face was – thus exchanging vertices and faces.

Here is a net (unfolded version) of a dodecahedron: Dodecahedra in Nature Compared to the other Platonic solids, the dodecahedral shape occurs relatively infrequently in nature. Perhaps the best-known examples of natural dodecahedra are those that occur in some quasicrystals such as Holmium-Magnesium-Zinc quasicrystals. Holmium-Magnesium-Zinc quasi crystals: (Please note: when people say that a diamond or garnet exhibits "dodecahedral habit", they are not referring to the Platonic dodecahedron – but rather to an entirely different polyhedron, the rhombic dodecahedron.

This is because if you choose two points on opposite sides of the hollow/dent, a straight line between these points will be partly outside the solid. Platonic solids are convex regular polyhedra. What this means in detail is that a Platonic solid is polyhedron with the following properties: All its faces are regular polygons – that is to say that the length of all the edges on each face are the same as each other, and likewise, the angles at each vertex on each face are all the same as each other.

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Amazing Math: Introduction to Platonic Solids by Sunil Tanna

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