Step 1: Analyzing the tangram.
A tangram consists of seven pieces that form a square. One of these pieces is changed in some options, and our task is to identify the ones that have been altered in size.
Step 2: Identifying changes in size.
- (A) shows a change in size of one of the pieces.
- (B) has no noticeable change in size.
- (C) shows an alteration in size.
- (D) also maintains the same size for the pieces.
\[
\boxed{(A) \text{ and } (C) have changed sizes.}
\]
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