By Peter Hilton, Jean Pedersen, Sylvie Donmoyer

This easy-to-read publication demonstrates how an easy geometric inspiration finds attention-grabbing connections and leads to quantity thought, the math of polyhedra, combinatorial geometry, and workforce thought. utilizing a scientific paper-folding approach it's attainable to build a typical polygon with any variety of aspects. This outstanding set of rules has ended in attention-grabbing proofs of yes ends up in quantity conception, has been used to respond to combinatorial questions related to walls of area, and has enabled the authors to acquire the formulation for the quantity of a customary tetrahedron in round 3 steps, utilizing not anything extra complex than uncomplicated mathematics and the main undemanding aircraft geometry. All of those rules, and extra, display the great thing about arithmetic and the interconnectedness of its a number of branches. designated directions, together with transparent illustrations, let the reader to realize hands-on adventure developing those types and to find for themselves the styles and relationships they unearth.

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**Example text**

11 (b) (a) A long-line 5-gon. (b) A short-line 5-gon. the first 10 triangles, and play with it. Try folding it on successive long lines. Then try folding it on successive short lines. 11. From the geometry of the situation we can figure out what the smallest angle on this U 2 D 2 -tape is approaching. 11(a) the base angles are equal. Let us call these angles α. Then, since the we know that 2α + 3π = π, from which it interior angle of a regular 5-gon is 3π 5 5 follows that α = π5 . There’s more!

However, we are very far from recommending that you fold all your regular polygons and construct all your polyhedra exactly as described. What we have done is to give you algorithms for the relevant constructions. Machines follow algorithms with relentless fervor, while human beings look for special ways of doing particular, convenient things. Always feel free to use your ingenuity to avoid an algorithm that is not working for you, or seems to you to be unduly complex. A word to the wise We’ve done a lot of field-testing of the “hands-on” material in this book.

1 What is the difference between (a) and (b)? 2 A square with a corner folded down. cannot be carried out with inappropriate materials. Exercise your own initiative in choosing which models to make but not in your choice of material (except within very narrow limits). 1. Do you see a difference? If not, look again! Notice that in (a) the portion of the strip going in the downward direction is on top of the horizontal part of the strip; whereas in (b) that portion is underneath the horizontal part of the strip.