Geometry Unit 3 Lesson F Mid-Unit Assessment

Front

What is a reflection in geometry?

Back

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

Front

What does it mean to reflect a point across the y-axis?

Back

To reflect a point across the y-axis, you change the sign of the x-coordinate while keeping the y-coordinate the same.

Front

What is the result of reflecting the point (2, -7) over the line y = x?

Back

The result is the point (-7, 2).

Front

What is the term for rotating a figure to the left?

Back

Counter-clockwise.

Front

What happens to the coordinates of a point when it is rotated 180° about the origin?

Back

The coordinates (x, y) become (-x, -y).

Front

What is a dilation in geometry?

Back

A dilation is a transformation that changes the size of a figure but not its shape, using a scale factor.

Front

What does a scale factor of 2 indicate in a dilation?

Back

A scale factor of 2 means the figure is enlarged to twice its original size.

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 is the effect of a reflection across the x-axis on the point (3, 4)?

Back

The reflected point is (3, -4).

Front

How do you determine the new coordinates after a 90° rotation counter-clockwise?

Back

For a point (x, y), the new coordinates will be (-y, x).