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[color=#1551b5]An isometrie is a trasformation in which a plane figure moves, but its size and shape don't change: the object and the image are congruent.[/color]
Un isometria è una trasformazione nella quale una figura piana si muove, ma la sua dimensione e la sua forma non cambiano: l'oggetto e l'immagine sono congruenti.
In alcune trasformazioni isometriche la figura si sposta sul piano, in altre esce dal piano.
Le trasformazioni isometriche, chiamate anche movimenti rigidi sono :
- La traslazione / [color=#1551b5]Translation[/color]
- La rotazione / [color=#1551b5]Rotation[/color]
- La simmetria assiale /[color=#1551b5] Reflection[/color]
A translation moves every point of a plane figure the same distance in the same direction; We describe the movement by a vector, a straight line withe an arrow.