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50 Years of ERIC
50 Years of ERIC
The Education Resources Information Center (ERIC) is celebrating its 50th Birthday! First opened on May 15th, 1964 ERIC continues the long tradition of ongoing innovation and enhancement.

Learn more about the history of ERIC here. PDF icon

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An Infinite Product Approach to Vieta's Formula.
Peer reviewed Peer reviewed
Dence, Joseph B.; Dence, Thomas P. – Mathematics and Computer Education, 1989
Presents an approach to Vieta's formula involving pi and infinite product expansions of the sine and cosine functions. Indicates how the formula could be used in computing approximations of pi. (MVL)
Descriptors: Algebra, College Mathematics, Instructional Materials, Mathematical Concepts
A Rapidly Converging Recursive Approach to Pi.
Peer reviewed Peer reviewed
Dence, Joseph B.; Dence, Thomas P. – Mathematics Teacher, 1993
Presents an algorithm to estimate pi by approximating a unit circle with a sequence of inscribed regular polygons. Demonstrates the application of the algorithm with a hand-held calculator and an Apple computer. Provides a program to calculate pi in Pascal programing language. (12 references) (MDH)
Descriptors: Algorithms, Area, Calculators, Computation