Unit 4 Vocabulary

Front

What is a transformation in geometry?

Back

A transformation is a change in the position, size, or orientation of a figure.

Front

What is a pre-image in a transformation?

Back

The original figure before the transformation.

Front

What is an image in a transformation?

Back

The resulting figure after the transformation.

Front

What is a translation in geometry?

Back

A translation slides a figure from one location to another without changing its shape, size, or orientation.

Front

What is the translation rule in coordinate form?

Back

(x,y)→(x+a,y+b) where a and b are the horizontal and vertical shifts.

Front

What is a reflection in geometry?

Back

A reflection flips a figure over a line (called the line of reflection) to create a mirror image.

Front

What is the reflection rule over the x-axis?

Back

(x,y)→(x,−y)

Front

What is the reflection rule over the y-axis?

Back

(x,y)→(−x,y)

Front

What is the reflection rule over the line y=x?

Back

(x,y)→(y,x)

Front

What is the reflection rule over the line y=−x?

Back

(x,y)→(−y,−x)