Question

multiple similarity transformations are performed on a triangle. which elements must be preserved?
○ orientation
○ side length
○ angle measure
○ overall size

Explanation:

Similarity transformations (like dilation, rotation, reflection, translation) for triangles preserve shape (similarity), meaning angle measures remain equal. Orientation can change (e.g., reflection), side length and overall size can change (e.g., dilation). So angle measure is preserved.

Answer:

angle measure