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Note on the expression for the area of a triangle in Cartesian Coordinates, and a general proof of the Addition Theorem in Trigonometry connected therewith

Published online by Cambridge University Press:  20 January 2009

Charles Tweedie
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In the Euclidean theory of areas, where convex polygons alone are considered, there is no question as to the sign of an area. The element of area is the rectangle, and an area is signless, or always positive.

Type
Research Article
Information
Proceedings of the Edinburgh Mathematical Society , Volume 19 , February 1900 , pp. 2 - 4
Copyright
Copyright © Edinburgh Mathematical Society 1900