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Concept · 4 steps · NESA MA4-ANG-C-01

Angles on Parallel Lines and a Transversal

One slanted line across two parallel lines makes eight angles — and almost all of them are secretly the same as, or partners of, each other. Crack the three rules and a wall of angle problems just falls over.

1Where it comes fromDrag the transversal and watch corresponding (F), alternate (Z) and co-interior (C) pairs light up. 2How to do itName the pair, pick the rule, find the angle — with a generator to lock it in. 3Where it gets trickyCo-interior angles add to 180°, and every rule needs the lines to be parallel. 4Out in the wildRailway tracks, ladders, parking lines — plus working backwards.
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