ACT Preparation / Unit 13 ACT 1213 short lesson, about 20 seconds
SSS, SAS, ASA and AAS
Captions available
The idea
Two triangles are congruent if three pairs of sides match (SSS), two sides and the angle between them (SAS), or two angles and a side in corresponding position (ASA, AAS).
In practice
Two triangles with sides 5 and 7 enclosing a 40° angle are congruent by SAS.
Where people slip
In SAS, the angle must sit between the two sides.
Your place on the trail
Every lesson rests on earlier ones and opens later ones. Tap any to jump.
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