A museum sells postcards of famous paintings. The postcards must be the same shape as the painting.

Postcard C is the same shape as the painting because they are in the same proportion.
It is defined as the law to prove that the two figures have the same shape, but it is not compulsory to have the same size. The ratio of the corresponding sides is in the same proportions and the corresponding angles are congruent.
It is given that:
A museum sells postcards of famous paintings.
Applying similarity law that states: The ratio of the corresponding sides is in the same proportions.
In poster A:
5/30.25 = 5/25.25
1/6.05 = 1/5.05
In the poster B:
8/30.25 = 4/25.25
1/3.78 = 1/6.312
In poster C:
6.05/30.25 = 5.05/25.25
1/5 = 1/5 (they are in the same proportion)
Thus, postcard C is the same shape as the painting because they are in the same proportion.
Learn more about the similarity law here:
brainly.com/question/8045819
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