yes they are it just has to be same size and shape
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In short, no. Similar shapes are shapes in which all corresponding angles congruent regardless of the length of the sides. Congruent shapes have congruent corresponding angles and corresponding sides. In effect congruent shapes is a special condition of similar shapes.
It is congruent
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.
Yes, congruence is a stronger condition than similarity.
to prove two triangles are similar, get 2 angles congruent