Rigid Motion and Congruence

Front

What are congruent figures?

Back

Figures that are the same size, same shape, and have the same angles.

Front

How do you reflect a figure over a horizontal line?

Back

You give the direction of the line, for example, y = -4.

Front

What is a 90° counterclockwise rotation?

Back

A transformation that turns a figure 90 degrees to the left around a point.

Front

What does it mean for sides and angles to be congruent?

Back

It means that the corresponding sides and angles of two figures are equal in measure.

Front

What is a reflection in geometry?

Back

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

Front

Identify the transformation: A triangle is flipped over the x-axis.

Back

Reflection across the x-axis.

Front

What is a rotation in geometry?

Back

A transformation that turns a figure around a fixed point.

Front

What is the result of a 180° rotation?

Back

The figure is turned halfway around, resulting in a figure that is upside down.

Front

What is the difference between a translation and a reflection?

Back

A translation slides a figure without changing its orientation, while a reflection flips it over a line.

Front

What is the notation for a reflection across the y-axis?

Back

The notation is (x, y) -> (-x, y).