The Best Geometry eBooks of All Time

How can we be sure that Pythagoras's theorem is really true? Why is the 'angle in a semicircle' always 90 degrees? And how can tangents help determine the speed of a bullet? David Acheson takes the reader on a highly illustrated tour through the history of geometry, from ancient Greece to the present day. He emphasizes throughout elegant deduction and practical applications, and argues that geometry can offer the quickest route to the whole spirit of mathematics at its best. Along the way, we encounter the quirky and the unexpected, meet the great personalities involved, and uncover some of the loveliest surprises in mathematics.

In one of the most stunning expositions of mathematical publishing, Oliver Byrne combines Euclid's geometric theories with vibrant colour proofs, turning what was already a cornerstone academic text into a pedagogical work of art. First published in 1847, Oliver Byrne's Elements of Euclid is an innovative educational masterpiece. Uniquely beautiful in its presentation, Byrne's edition was the first attempt to illustrate the classic books of mathematical theorems written by the ancient Greek mathematician, Euclid of Alexandria, in 300BC.

Scattered across each page in brilliant reds, blues and yellows are triangles, squares and circles combined in a myriad of combinations with intersecting lines and numbers. These intricate figures express the proofs of many of the iconic geometric equations that form the bedrock of mathematical study. This stunning example of numerical visual study greatly influenced the history of mathematics, with Euclid's text being used in classrooms until the late nineteenth century. It has also proven to be an indispensable inspiration for following twentieth-century art movements, with avant-garde groups like De Stijl and The Bauhaus using Byrne's iconic colour, line work and form in many of their works. A facsimile edition of this legacy work has been painstakingly restored for a new generation to enjoy. Taking special care to conserve the colours, shapes and text as they were printed on publication in the hope to recapture the magic of this beautiful volume for future readers, both inside and outside of the classroom.

Reveals how the number science found in ancient sacred monuments reflects wisdom transmitted from the angelic orders. • Explains how the angels transmitted megalithic science to early humans to further our conscious development. • Decodes the angelic science hidden in a wide range of monuments, including Carnac in Brittany, the Great Pyramid in Egypt, early Christian pavements, the Hagia Sophia in Istanbul, Stonehenge in England, and the Kaaba in Mecca. • Explores how the number science behind ancient monuments gave rise to religions and spiritual practices.

The angelic mind is founded on a deep understanding of number and the patterns they produce. These patterns provided a constructive framework for all manifested life on Earth. The beauty and elegance we see in sacred geometry and in structures built according to those proportions are the language of the angels still speaking to us. Examining the angelic science of number first manifested on Earth in the Stone Age, Richard Heath reveals how the resulting development of human consciousness was no accident: just as the angels helped create the Earth’s environment, humans were then evolved to make the planet self-aware. To develop human minds, the angels transmitted their own wisdom to humanity through a numerical astronomy that counted planetary and lunar time periods. Heath explores how this early humanity developed an expert understanding of sacred number through astronomical geometries, leading to the unified range of measures employed in their observatories and later in cosmological monuments such as the Giza Pyramids and Stonehenge. The ancient Near East transformed megalithic science into our own mathematics of notational arithmetic and trigonometry, further developing the human mind within the early civilizations. Heath decodes the angelic science hidden within a wide range of monuments and sites, including Carnac in Brittany, the Great Pyramid in Egypt, Teotihuacan in Mexico, early Christian pavements, the Hagia Sophia in Istanbul, and the Kaaba in Mecca. Exploring the techniques used to design these monuments, he explains how the number science behind them gave rise to ancient religions and spiritual practices. He also explores the importance of lunar astronomy, first in defining a world suitable for life and then in providing a subject accessible to pre-arithmetic humans, for whom the Moon was a constant companion.