ACT Preparation / Unit 13 ACT 1212 short lesson, about 20 seconds
Congruent Triangles
Captions available
The idea
Congruent triangles have the same size and shape: all corresponding sides and angles are equal. The congruence statement lists vertices in corresponding order.
In practice
Triangle ABC ≅ triangle DEF means A matches D, B matches E, and side AB equals side DE.
Where people slip
Read the letter order, not the picture: in that statement, side BC corresponds to EF.
Your place on the trail
Every lesson rests on earlier ones and opens later ones. Tap any to jump.
Builds on
Unlocks
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