Rotational and Reflectional Symmetry Practice

Front

What is rotational symmetry?

Back

A shape has rotational symmetry if it can be rotated (less than a full turn) about a center point and still look the same.

Front

Define the smallest angle of rotation for a shape with rotational symmetry.

Back

The smallest angle of rotation is the least angle through which a shape can be rotated to map onto itself.

Front

What is the order of rotational symmetry?

Back

The order of rotational symmetry is the number of times a shape maps onto itself during a full rotation of 360°.

Front

How do you determine the angle of rotation for a shape with rotational symmetry?

Back

Divide 360° by the order of rotational symmetry.

Front

What is reflectional symmetry?

Back

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

Front

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

Back

Count the number of ways a shape can be folded in half so that both halves match exactly.

Front

What is the relationship between lines of symmetry and rotational symmetry?

Back

Shapes with more lines of symmetry often have higher orders of rotational symmetry.

Front

What is the angle of rotation for a shape with an order of 5?

Back

The angle of rotation is 72° (360° ÷ 5).

Front

How many lines of symmetry does a triangle have?

Back

An equilateral triangle has 3 lines of symmetry.

Front

What is the order of rotational symmetry for a square?

Back

The order of rotational symmetry for a square is 4.