Geometry H 4.4-4.5 Check-up

Front

What is a dilation in geometry?

Back

A dilation is a transformation that alters the size of a figure but not its shape, using a scale factor to determine how much to enlarge or reduce the figure.

Front

What is the scale factor in a dilation?

Back

The scale factor is a number that describes how much a figure is enlarged or reduced during a dilation. A scale factor greater than 1 enlarges the figure, while a scale factor between 0 and 1 reduces it.

Front

How do you find the image of a point after dilation?

Back

To find the image of a point after dilation, multiply the coordinates of the point by the scale factor.

Front

What is a congruence transformation?

Back

A congruence transformation is a transformation that preserves the shape and size of a figure, including translations, rotations, and reflections.

Front

What is a rotation in geometry?

Back

A rotation is a transformation that turns a figure around a fixed point, called the center of rotation, by a specified angle.

Front

What is a reflection in geometry?

Back

A reflection is a transformation that flips a figure over a line, creating a mirror image of the original figure.

Front

What is the difference between a rotation and a reflection?

Back

A rotation turns a figure around a point, while a reflection flips it over a line.

Front

What does it mean for two figures to be congruent?

Back

Two figures are congruent if they have the same shape and size, meaning one can be transformed into the other through congruence transformations.

Front

How do you describe a translation in geometry?

Back

A translation is a transformation that moves every point of a figure a constant distance in a specified direction.

Front

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

Back

A reflection in the x-axis changes the sign of the y-coordinate of each point in the figure.