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By Steven G. Krantz

An Episodic background of Mathematics provides a sequence of snapshots of the background of arithmetic from precedent days to the 20 th century. The motive isn't really to be an encyclopedic historical past of arithmetic, yet to offer the reader a feeling of mathematical tradition and background. The ebook abounds with tales, and personalities play a powerful function. The publication will introduce readers to a few of the genesis of mathematical principles. Mathematical historical past is fascinating and lucrative, and is an important slice of the highbrow pie. an exceptional schooling includes studying varied equipment of discourse, and definitely arithmetic is without doubt one of the so much well-developed and critical modes of discourse that we have got. the focal point during this textual content is on becoming concerned with arithmetic and fixing difficulties. each bankruptcy ends with a close challenge set that may give you the pupil with many avenues for exploration and plenty of new entrees into the topic.

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We shall not repeat all the steps of the calculation but just note the high points. First, we construct the regular 48-gon by placing small triangles along each of the edges of the dodecagon. 31. 32. The usual calculation shows that the side of the small added triangle has √ length 2 − 2 + 2 + 3. Thus we end up examining a new isosceles triangle, which is 1/48th of the 48-sided polygon. 33. 3 Archimedes 35 The usual calculations, just as we did for the polygons having 6 or √ 12 or 24 sides, show that this new triangle has base 2 − 2 + 2 + 3 and height 2+ 2+ 2+ √ 3/2.

We use the Pythagorean theorem to calculate the length x of a side of the new dodecagon. It is √ 2 √ √ 3 1 2 3 1 x= + 1− 3+ + 1− = = 2 − 3. 24). We have just calculated that each side √ of the dodecahedron has length 2 − 3. If we can calculate the area of each of the congruent subtriangles, then we can obtain the area of the entire dodecahedron (by multiplying by 12). 25. This is one of the 12 triangles that makes up the dodecahedron. It has base √ 2 − 3. Each of the two sides has length 1. Thus we may use the Pythagorean theorem to determine that the height of the triangle is  h= 2− 12 −  2 √ 2 3 √ 2− 3 1− = 4 = √ 2+ 3 .

14159265 . .. The next regular polygon in our study has 192 sides. It breaks up naturally into 192 isosceles triangles, each of which has area 2− 2+ A(T ) = 2+ √ 2+3 . 4 Thus the area of the regular 192-gon is 2− A(P ) = 192 · 2+ 2+ 4 √ 2+3 √ = 48 · 2− 2+ 2+ 2+3. 14103 . 3 Archimedes 37 This new approximation of π is accurate to nearly three decimal places. Archimedes himself considered regular polygons with nearly 500 sides. His method did not yield an approximation as accurate as ours. But, historically, it was one of the first estimations of the size of π.

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