CK-12 Foundation
Ck 12: Precalculus Concepts 2.0
A complete high school Precalculus Concepts course. Includes 'Related Modalities' for each lesson that teach the same concept in different ways. The text materials follows Algebra II and comes before Calculus or Statistics. The content...
Other
Platonic Realms: The Mathematical Art of m.c. Escher
Math Academy Online presents a great M.C. Escher (1898-1972 CE) site for connecting the arts and mathematics. As even Escher said, "For me it remains an open question whether [this work] pertains to the realm of mathematics or to that of...
Agnes Scott College
Agnes Scott College: Biographies of Women Mathematicians: Helena Rasiowa
Article highlights the accomplishments of Polish mathematician Helena Rasiowa who worked in algebraic logic and the mathematical foundations of computer science.
PBS
Pbs: Horizontal and Vertical Distances on the Cartesian Graph
In this interactive, students use logic and mathematical skill to place aquatic animals at locations on a Cartesian graph with cardinal directions. Then, they determine both the vertical and horizontal distances between points. The...