Take the triangle for instance, there are 3 types. One is the same on each side which is the equilateral. But the other 2 types are flat on 2 sides and diagonal on the other side.
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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.]
Are congruent figures always similar? Yes.
No because Similar figures are the same shape, angles, and types but not lengths. Congruent means EXACTLY the same in everything.
Yes, congruent figures have to be similar