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Alternate angles: Góc so le trong

/ˈôltərˌnāt ˈaNGɡəlz/

Tiếng Việt: Góc so le trong

English: When two lines are crossed by another line (the Transversal), a pair of angles
              • on each of those two lines
              • on opposite sides of the transversal
              • but inside those two lines 
              are called Alternate Angles.
             When the two lines are parallel Alternate Angles are equal.

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