Rotational and Reflection Symmetry

Front

What is rotational symmetry?

Back

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

Front

What is reflectional symmetry (line symmetry)?

Back

A shape has reflectional symmetry if it can be divided into two identical halves by a line.

Front

What is the order of rotation?

Back

The order of rotation is the number of times a shape can be rotated to look the same within a full 360-degree rotation.

Front

What is the angle of rotation?

Back

The angle of rotation is the degree measure of the angle through which a shape is rotated to coincide with itself.

Front

How many lines of symmetry does a circle have?

Back

A circle has an infinite number of lines of symmetry.

Front

What is the relationship between order of rotation and angle of rotation?

Back

The order of rotation multiplied by the angle of rotation equals 360 degrees.

Front

If a shape has an order of rotation of 4, what is the angle of rotation?

Back

The angle of rotation is 90 degrees (360° ÷ 4).

Front

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

Back

A square has both line symmetry (4 lines) and rotational symmetry (order 4, angle 90°).

Front

How can you determine the number of lines of symmetry in a regular polygon?

Back

A regular polygon has as many lines of symmetry as it has sides.

Front

What is point symmetry?

Back

A shape has point symmetry if it looks the same when rotated 180 degrees around a central point.