There are three kinds of isometric changes of 2 -dimensional shapes: translations, rotations, and also reflections. ( Isometric means that the change doesn"t change the dimension or form of the figure.) A fourth kind of transformation, a dilation , is not isometric: that preserves the shape of the figure yet not that is size.

## Translations

A translate in is a sliding the a figure. For example, in the figure below, triangle A B C is translated 5 systems to the left and also 3 systems up to obtain the image triangle A " B " C " . This translation have the right to be described in name: coordinates notation as ( x , y ) → ( x − 5 , y + 3 ) .

## Rotations

A second type of change is the rotation . The figure below shows triangle A B C rotated 90 ° clockwise around the origin. This rotation can be described in name: coordinates notation together ( x , y ) → ( y , − x ) . (You can examine that this works by plugging in the collaborates ( x , y ) of every vertex.)

## reflections

A third form of revolution is the enjoy . The figure listed below shows triangle A B C reflected throughout the line y = x + 2 . This reflection can be explained in coordinate notation as ( x , y ) → ( y − 2 , x + 2 ) . (Again, girlfriend can inspect this through plugging in the collaborates of every vertex.)

## Dilations

A dilation is a revolution which conservation the shape and also orientation that the figure, yet changes that is size. The scale factor of a dilation is the factor whereby each direct measure that the number (for example, a side length) is multiplied.

The figure listed below shows a dilation with scale element 2 , focused at the origin.

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