Heng tried to define a reflection across line r.

Any point M not on the line of reflection maps to a point M' such that the midpoint L of M→M' is on line r.

Which counterexample shows that Heng's definition does not fully define a reflection?

Heng tried to define a reflection across line r Any point M not on the line of reflection maps to a point M such that the midpoint L of MM is on line r Which co class=