A claim says every? Try one counterexample.

Test a universal claim with one original geometry counterexample. Stretch a square sideways, keep the right angles, and explain why the result need not be a square. Original animation with synthetic English narration generated locally. Nonclinical study practice; no claimed learning outcome or source endorsement. NRICH supports the geometry definitions; the artwork and questions are original. Full companion: https://meyshan.com/tube/watch/9ce9335a-0578-4670-bff7-50d8924790e5 Try Recall: https://meyshan.com/app/recall