The question asks which features of figure $JKLM$ remain the same after any rigid transformation.

Rigid transformations include translations, rotations, and reflections. These transformations maintain certain properties of geometric figures:

• Size: The distance between any two points remains constant, meaning the figure keeps the same length and width.
• Shape: The internal angles remain the same, preserving the overall shape.
• Location: The location of the figure can change in a rigid transformation.
• Direction: The orientation may change, such as in the case of reflections.

In rigid transformations, the properties that remain unchanged are size and shape.

Thus, the correct answer is:

Size and shape.

Do you want details or have any questions?

Here are five related questions for further exploration:

1. What are the types of rigid transformations?
2. How does a reflection differ from a rotation?
3. What is the difference between rigid and non-rigid transformations?
4. How can we determine if two figures are congruent using rigid transformations?
5. How do translations affect the coordinates of a figure?

Tip: Remember, rigid transformations do not alter the lengths of sides or angles within the figure; they only change the position or orientation!