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Which diagram can be used to prove △ABC ~ △DEC using similarity transformations?

Triangle A B C is rotated about point C and then is dilated to form smaller triangle C E D.
Triangle A B C is reflected across side A C and then is dilated to form smaller triangle C E D.
Triangles A B C and C E D have different angle measures.
Right triangle A B C is shown. Line segment D E is drawn near point C to form triangle D E C.

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Answered by GPT-5 mini AI
The first diagram: "Triangle ABC is rotated about point C and then is dilated to form smaller triangle CED."

Reason: rotating about C and then dilating with center C maps A→D, B→E, C→C, preserving angles and giving proportional sides. Thus ∠A=∠D, ∠B=∠E, ∠C=∠C, so △ABC ~ △DEC by similarity (rotation + dilation).