Geometry: Unit 3 Review 24/25

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 certain angle in a specified direction.

Front

What is the degree of rotation for a 90° clockwise rotation?

Back

A 90° clockwise rotation turns the figure 1/4 of a full circle in the clockwise direction.

Front

How do you reflect a point over the y-axis?

Back

To reflect a point (x, y) over the y-axis, change the sign of the x-coordinate to get (-x, y).

Front

What happens to a figure when it is dilated by a scale factor greater than 1?

Back

The figure enlarges, meaning it gets bigger while maintaining its shape.

Front

What is the result of translating a point (x, y) 3 units to the left and 9 units down?

Back

The new coordinates will be (x - 3, y - 9).

Front

What is the definition of a reflection in geometry?

Back

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

Front

What is the coordinate of point B (-6, -7) after reflecting over the y-axis?

Back

The new coordinates will be (6, -7).

Front

What is the effect of a dilation with a scale factor of 1?

Back

The figure remains the same size; it does not change.

Front

How do you perform a 270° rotation counterclockwise?

Back

A 270° counterclockwise rotation is equivalent to a 90° clockwise rotation.

Front

What is the formula for finding the new coordinates after a rotation of 90° around the origin?

Back

For a point (x, y), the new coordinates after a 90° rotation are (-y, x).