Desargues' Theorem in 2D and 3D

Author:Steve Phelps

If the three straight lines joining the corresponding vertices of two triangles meet in a point (the perspector) then the three intersections of pairs of corresponding sides are lie on a line (the perspectrix).

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Slopes of Parallel Lines
Equilateral Triangle Cross Sections
Solving 2x2 and 3x3 Systems Using Cramer's Rule
Identifying Sine, Cosine, Tangent Ratios in Right Triangles (Quick)
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Graphing an Inequality
sum of the interior angles of a triangle is 180 degrees
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Trigonometry
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