You can have two shapes - a small one and a big one - whose angles are congruent but the sides are not. In that case the shapes are not congruent but similar.
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Yes, they do.
Two shapes that are the same shape and size are congruent.
A figure that has both same size and shape is congruent.
Yes because to be similar the shapes need to have the same ratio of sides and similar angles. To be congruent the shapes have to be the same shape and size, so 2 congruent shapes will always be similar.
They are said to be congruent.