No. There are some figures that don't have a name that are five sided.
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All congruent figures are similar figures, and have identical sizes.
Congruent figures are similar - in sides as well as angles. Corresonding angles of similar figures congruent but their sides are not. The sides are all in some fixed ratio. [If that ratio is 1, the figures are congruent.]
No because Similar figures are the same shape, angles, and types but not lengths. Congruent means EXACTLY the same in everything.
Circles and all regular polygons.
Are congruent figures always similar? Yes.