San Antonio College Library

Spherical trigonometry was at the heart of astronomy and ocean-going navigation for two millennia. The discipline was a mainstay of mathematics education for centuries, and it was a standard subject in high schools until the 1950s. Today, however, it is rarely taught. Heavenly Mathematics traces the rich history of this forgotten art, revealing how the cultures of classical Greece, medieval Islam, and the modern West used spherical trigonometry to...

Everyone knows what a triangle is, yet very few people appreciate that the common three-sided figure holds many intriguing secrets. For example, if a circle is inscribed in any random triangle and then three lines are drawn from the three points of tangency to the opposite vertices of the triangle, these lines will always meet at a common point--no matter what the shape of the triangle. This and many more interesting geometrical properties are revealed...

Offers a comprehensive overview of basic geometry, with easy-to-understand explanations of concepts, principles, definitions, examples, and applications.

This video tutorial works through math problems/equations that address topics in Calculus 2, Polar & Parametric. This specific tutorial addresses Converting polar equations.

This video tutorial works through math problems/equations that address topics in Calculus 1, Derivatives. This specific tutorial addresses Product rule, three or more functions.

This video tutorial works through math problems/equations that address topics in Precalculus. This specific tutorial addresses graph the polar curve, circle.