Geometry

Question Analysis:
This question involves the core definition of rigid motion.
The main focus is on identifying the key properties preserved during rigid transformations.

Key Concept Explanation:
Rigid motions (or isometries) include translations, rotations, and reflections.
They always preserve size, shape, lengths, and angle measures.
The figure remains congruent after the transformation.
However, orientation and coordinates may change depending on the type of motion.

Step-by-Step Solution:
Rigid motion preserves the object’s shape and size.
The distance between any two vertices also remains the same.
Therefore, options A and B describe properties always preserved in rigid motion.

Option Analysis:
A. Shape and size → ✅ Always preserved.
B. Distance between points → ✅ This ...