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← Geometrical Relationships
Concept · 4 steps · NESA MA4-ANG-C-01

Angles at a Point

Three facts do nearly all the heavy lifting in angle geometry: a straight line is 180°, a full turn is 360°, and vertically opposite angles match. Lock these in and missing-angle problems stop being a guessing game.

1Where it comes fromDrag rays around a point and watch the three facts hold no matter what. 2How to do itFind a missing angle with each fact — name it, write the sum, solve for x. 3Where it gets trickySame picture, wrong rule. Learn to pick 180 vs 360 vs equal. 4Out in the wildPizza slices, clock hands and road junctions — and working backwards.
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