By Robin Hartshorne

ISBN-10: 1441931457

ISBN-13: 9781441931450

This publication deals a different chance to appreciate the essence of 1 of the nice thinkers of western civilization. A guided studying of Euclid's components results in a severe dialogue and rigorous smooth remedy of Euclid's geometry and its more moderen descendants, with entire proofs. themes contain the advent of coordinates, the speculation of zone, historical past of the parallel postulate, many of the non-Euclidean geometries, and the commonplace and semi-regular polyhedra.

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**Additional resources for Geometry: Euclid and Beyond (Undergraduate Texts in Mathematics)**

**Sample text**

The axiom that halves of equals are equal to conclude the triangles have equal content. 42 1. 47), the theorem of Pythagoras. The statement of the theorem is that if ABC is a right K triangle, then the squares on the two legs together have equal content to the square on the hypotenuse. The proof goes like this. The triangle ABF is one half of the square ABFG. 37). The triangle BFC is congruent to the triangle BAD. 37). This latter triangle is equal to one-half of the rectangle BDLM. Hence the square ABFG has equal content to the rectangle BDLM.

A .... 9 Construct a circle inscribed in a given triangle ABC (par = 13). , \ / c.. 2. 10 Construct a circle circumscribed about a given triangle ABC (par = 7). 11 Given a line 1, a line segment d, and a point 0, construct a circle with center o that cuts off a segment congruent to d on the line 1 (par = 9). ~,,- - , t.. - - - \ I on 1, construct a circle that passes through A and is tangent to the line 1 at B (par = 8). B I \ , A\ ......... e ,.. 13 Construct three circles, each one meeting the other two at right angles.

Ruler and Compass Constructions 23 exact. In other words, it must be possible to prove using the reasoning of abstract geometry that this construction in its ideal form gives the exact result we are seeking. This distinction has caused considerable confusion among amateur mathematicians through the ages, who were trying to make constructions, now known to be impossible, of trisecting the angle or squaring the circle . For many of their constructions are remarkably accurate, while failing to be mathematically exact.

### Geometry: Euclid and Beyond (Undergraduate Texts in Mathematics) by Robin Hartshorne

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