Geometry Semester Review Topic 3

Front

What is reflectional symmetry?

Back

A figure has reflectional symmetry if it can be divided into two identical halves that are mirror images of each other.

Front

What is rotational symmetry?

Back

A figure has rotational symmetry if it can be rotated around a central point and still look the same at certain angles.

Front

How can you determine if a figure has reflectional symmetry?

Back

To determine reflectional symmetry, draw a line (axis of symmetry) through the figure. If both sides are mirror images, it has reflectional symmetry.

Front

How can you determine if a figure has rotational symmetry?

Back

To determine rotational symmetry, rotate the figure around a central point. If it looks the same at any angle less than 360 degrees, it has rotational symmetry.

Front

What is an example of a shape with both reflectional and rotational symmetry?

Back

A circle has both reflectional and rotational symmetry.

Front

What is an example of a shape with only reflectional symmetry?

Back

A rectangle has reflectional symmetry but not rotational symmetry.

Front

What is an example of a shape with only rotational symmetry?

Back

An equilateral triangle has rotational symmetry but not reflectional symmetry.

Front

What is the axis of symmetry?

Back

The axis of symmetry is a line that divides a figure into two mirror-image halves.

Front

What is the order of rotational symmetry?

Back

The order of rotational symmetry is the number of times a figure can be rotated to look the same within one full rotation (360 degrees).

Front

Can a figure have no symmetry?

Back

Yes, a figure can have no symmetry if it cannot be divided into identical parts or does not look the same when rotated.