1887

n Learning and Teaching Mathematics - Deriving the composite angle formulae for sine from Ptolemy

Volume 2012, Issue 13
  • ISSN : 1990-6811

Abstract

Ptolemy of Alexandria (approximately 100-168 AD) not only developed his Planetary theory in his treatise , but also proved the following remarkable theorem, known as Ptolemy's theorem, which he used to compute his table of chords (trigonometric tables) that was in use for over 1000 years: "The sum of the two products of the opposite sides of a cyclic quadrilateral is equal to the product of the diagonals; e.g. + = ."

Loading full text...

Full text loading...

Loading

Article metrics loading...

/content/amesal/2012/13/EJC126268
2012-01-01
2019-08-18

This is a required field
Please enter a valid email address
Approval was a Success
Invalid data
An Error Occurred
Approval was partially successful, following selected items could not be processed due to error