Which three types of transformations result in congruent shapes?

There are three main types of congruence transformations: Translation (a slide) Rotation (a turn) Reflection (a flip)

Step-by-step explanation:

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There are three main types of congruence transformations: reflections (flips), rotations (turns), and translations (slides). These congruence transformations can be used to obtain congruent shapes or to verify that two shapes are congruent

i'm assuming it's looking for the missing length, which should be 4cm

hope this !