An isometric transformation is one in which preserves the shape and size of the pre-image. Which of the following transformations will not prove to be isometric? translation tessellation rotation dilation

The answer would be dilation
Isometric transformation is one in which preserves the shape and size of the pre-image. Dilation is not isometric because it will enlarge the graph, thus changes the image size. 
Rotation, translation, and tesselation won't change the shape and size.