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]

新しい教材

Domain of f(x,y)
Taylor Error Bound
Row and Column Views of Systems of Linear Equations
Rule of Sarrus - Determinant of a 3×3 Matrix
Fractal Tétraèdre. Dilatation -1/2 centre triangles

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Sunflowers are Irrationally Pretty
Investigating Domain and Range of Rational Functions
MO-10
Animation 198
Harmonisk svängning i fjäder

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