This text is the fifth and final in the series of educational books written by Israel Gelfand with his colleagues for high school students. These books cover th

Learn geometry at your own pace What are congruent circles? How do you find the hypotenuse of a triangle? What is the sum of the angles in a decagon? How can yo

This classic text serves as a tool for self-study; it is also used as a basic text for undergraduate courses in differential geometry. The author's ability to e