Rational Trigonometry to Universal Geometry

N J Wildberger’s new book, DIVINE PROPORTIONS : Rational Trigonometry to Universal Geometry, proposes to replace the grueling learning curve of trigonometry with a much simpler concept of quadrance and spread. “Quadrance is a way of measuring the separation between two points: it’s the distance squared,” he said. “The spread is the ratio of two quadrances obtained by dropping a perpendicular line from one point on one of the lines to another line.” In the book Wildberger illustrates how his method solves problems with more accuracy without tables or calculators.
via Physorg | The Australian
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