They are not necessarily also congruent because: D. figures can be similar without being the same size.
Figures that are congruent to each other have the same size and the same shape. However, on the other hand, similar figures do not have the same size but have the same shape.
The corresponding angles of both similar figures and congruent figures are the, while only the corresponding sides of congruent figures are the same. On the contrary, the corresponding sides of similar figures are not congruent, they are proportional.
Therefore, if figures FGH and F'G'H' are similar, they are not necessarily also congruent because: D. figures can be similar without being the same size.
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