Applications of Parallelism

Mathematics — Second Preparatory

Common mistakes

Confusing corresponding and alternate angles. Corresponding angles are on the same side of the transversal, while alternate angles are on opposite sides.
Adding two alternate angles to get 180°. The correct relation is that they are equal.
Forgetting that co-interior angles add up to 180° and are not equal.
Applying the relations to lines that are not known to be parallel.

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