Geometry

Question Analysis:
This tests knowledge of what remains constant under rigid motions.

Key Concept Explanation:
Rigid motions (isometries) preserve distance, angles, and parallelism.
Only reflections and glide reflections alter orientation.

Step-by-Step Solution:
Side lengths stay the same in all rigid motions. ✅
Angle measures remain unchanged. ✅
Orientation remains the same unless it's a reflection/glide reflection. ❌
Area remains unchanged (since size does not change). ✅
Parallelism is preserved. ✅

Option Analysis:
A) Side lengths (Correct) – Always preserved in isometries.
B) Angle measures (Correct) – ...