Geometry Symmetry 1.5

Front

What is rotational symmetry?

Back

Rotational symmetry is when a shape can be rotated around a central point and still look the same at certain angles of rotation.

Front

What is the smallest angle of rotation that maps a shape to itself?

Back

The smallest angle of rotation that maps a shape to itself is called the angle of rotational symmetry.

Front

How do you determine the number of lines of symmetry in a shape?

Back

To determine the number of lines of symmetry, you can fold the shape along different lines to see if both halves match perfectly.

Front

What is a line of symmetry?

Back

A line of symmetry is an imaginary line that divides a shape into two identical halves that are mirror images of each other.

Front

What is the difference between rotational symmetry and reflectional symmetry?

Back

Rotational symmetry involves rotating a shape around a point, while reflectional symmetry involves flipping a shape over a line.

Front

How many lines of symmetry does a square have?

Back

A square has 4 lines of symmetry.

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 angle of rotation for a shape with 4-fold rotational symmetry?

Back

The angle of rotation for a shape with 4-fold rotational symmetry is 90°.

Front

Identify the transformation: A shape is turned 90° clockwise. What is this transformation called?

Back

This transformation is called a 90° clockwise rotation.

Front

What is the angle of rotation for a shape with 2-fold rotational symmetry?

Back

The angle of rotation for a shape with 2-fold rotational symmetry is 180°.