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]

New Resources

Slope Between 2 Points (Phase 2)
Row and Column Views of Systems of Linear Equations
Taylor Error Bound
רישום חופשי
Graph of Slopes of Tangent Lines

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Lights Out (Game with Solution)
trigonometric ratios of acute angle ( sine/ cosine/ tangent)
Tangents of a Parabola to a Focal Chord
בעיית הספק 1 - דרך 3
The sound of a sine function

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Dilation
Rectangle
Trapezoid
Differential Equation
Arithmetic Operations