Pappus' Theorem 2
- Author:
- Ryan Hirst
Written in vector notation...
The length of a vector v is √(v∙v)
In the plane, (a x b) = |a||b|sin x, the determinant of a and b.
(is probably an abuse of notation)
In three dimensions (a x b) = c, a vector. Its length is |a||b|sin x, and it is perpendicular to both a and b.
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Desargues' Theorem:
1) Pappus' Theorem: http://www.geogebratube.org/material/show/id/35140
→2) Vector formula
3) Desargues' Theorem: http://www.geogebratube.org/material/show/id/35525