Unit 1 Flashcard 1: lesson 1 - 7

Front

What is a transformation in geometry?

Back

A transformation is an operation that moves or changes a figure in some way to produce a new figure.

Front

What is a reflection in geometry?

Back

A reflection is a transformation that flips a figure over a line to produce a mirror image.

Front

What does it mean to rotate a figure?

Back

To rotate a figure means to turn it around a fixed point by a certain angle.

Front

What is a rigid transformation?

Back

A rigid transformation is a transformation that does not change the shape or size of a figure.

Front

What is the angle of rotation for a 90° counterclockwise rotation?

Back

A 90° counterclockwise rotation turns a figure 90 degrees to the left around a fixed point.

Front

What is the effect of a reflection over the x-axis?

Back

A reflection over the x-axis flips the figure vertically, changing the sign of the y-coordinates.

Front

What is the effect of a reflection over the y-axis?

Back

A reflection over the y-axis flips the figure horizontally, changing the sign of the x-coordinates.

Front

What is the definition of a rotation?

Back

A rotation is a transformation that turns a figure around a fixed point by a certain angle.

Front

What is the difference between a rotation and a translation?

Back

A rotation turns a figure around a point, while a translation slides a figure from one place to another without turning it.

Front

What does it mean for a transformation to be rigid?

Back

A rigid transformation preserves the shape and size of the figure, meaning the figure remains congruent.