Matematika Testy - Cvičení z matematiky

Measurement of angles - parallel lines

Pairs of angles

Two parallel lines crossed by another line (called transversal) form a special pairs of angles:

Alternate interior angles are formed on opposite sides of the transversal (green pair, blue pair). When the pair of lines are parallel, the resulting alternate interior angles are congruent (equal to each other). Each green and blue angle are supplementary (green+blue=180°)

Alternate exterior angles are formed on opposite sides of the transversal on the outside (green pair, blue pair). When the pair of lines are parallel, the resulting alternate interior angles are congruent (equal to each other). Again, each green and blue angle are supplementary (green+blue=180°)

Corresponding angles are the angles in matching corners (four pairs of different color). When the pair of lines are parallel, the corresponding angles are congruent (equal to each other).


   
   

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