To determine the type of transformation applied to triangle \( \triangle ABC \), we would need more specific information or a visual representation of the triangles before and after the transformation. However, based on the options you've provided, here are brief explanations of each type of transformation:
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Reflection: This flips the triangle over a line (the line of reflection), creating a mirror image.
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Composition: This involves applying two or more transformations in sequence, such as a translation followed by a rotation.
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Rotation: This turns the triangle around a fixed point (the center of rotation) by a certain angle.
If you can provide more context or specific details about how triangle \( \triangle ABC \) has changed (such as the orientation or position), I can help you identify the transformation more accurately!