Question

which of the numbered stones shown cannot be mapped to another with a rigid motion?
stones □ cannot be mapped to another stone with a rigid motion.
(type whole numbers. use a comma to separate answers as needed.)

Explanation:

Step1: Recall the definition of rigid motion

Rigid motion (translation, rotation, reflection) preserves the shape and size of a figure.

Step2: Analyze each stone

By visual inspection, stone 4 has a unique shape (smaller and a different - proportioned pentagon - like shape compared to others). Stones 1, 5, 10 are similar in a larger - rectangular sense. Stones 2, 3, 7, 9, 14 have a more - parallelogram - like or elongated - quadrilateral shape. Stones 6, 8, 11, 12, 13 have a more - irregular - quadrilateral or pentagonal (but larger than stone 4) shape.

Answer:

4