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The six angle-chasing factsTechnique

Technique

The six angle-chasing facts

Pass a known angle along, one fact per move

3 min 3 steps

Six facts cover nearly every angle the SAT draws. I used to know every angle on the school bus too, mostly the ones the mirror missed.

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The first step is free. A free account opens the rest.

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Triangle sum, full turn, linear pairFactFill in any missing angle from 180 or 360
Parallel-line angle pairsFactEight angles, two measures, one sum of 180
Exterior angle of a triangleFactSkip the third angle: add the far two
Equal sides face equal anglesFactLook across from the equal sides for the equal angles

Used by

Angle chasingTacticOne fact per step, from the given to the target
Similar-triangle and segment ratiosTacticMatch the angles first, then use whole sides
Arcs, sectors, chords, and anglesTacticTurn the central angle into a fraction of the circle