Lowercase "o" and upper case "O" are often congruent (depending on the typeface)
so are c, p, s, u, v, w, x, y, z...
Congruent means having the same 'shape' or proportions. "H" and "h" are not congruent
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All regular shapes have congruent sides.
Yes, that's what makes them congruent!
Isosceles Tetrahedron.