Lesson 86. Properties of Parallel Lines

T6-criterion for parallel lines

[bgcolor=orange] If two lines are intersected by a third line, and alternate interior (or exterior) angles are equal, then the original two lines are parallel. [/bgcolor]

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Reflection = 180° Rotation about a Line
Prism Drawn in 1-Point Perspective
Volume by Disk/Washer around y
Equation of Locus - Parabola
Untitled

Discover Resources

Is It A Function
tehtava12c
tool_curve_problem
AA Similarity Theorem
Linear approximation and tangent plane
Parallel Lines and Transversal

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Poisson Distribution
Equilateral Triangles
Parabola
Right Triangles
Quadratic Equations