<p>This is an introduction to geometric algebra in n-dimensional Euclidean space and its application to manifolds and to calculus on manifolds.&nbsp;The treatment is moderately rigorous and is suitable for advanced undergraduates and beginning graduate students in mathematics though it should also be accessible to well-prepared students in physics engineering computer science statistics etc.&nbsp;Preparation in linear algebra and multivariable analysis as encountered in calculus as well as a modest amount of mathematical maturity should be sufficient.</p>