3-5 Symmetry

What is reflectional symmetry?

• Reflectional symmetry is a type of symmetry where one half of an object is a reflection of the other half.

• Reflectional symmetry is a type of symmetry where one half of an object is a rotated version of the other half.

• Reflectional symmetry is a type of symmetry where one half of an object is a scaled version of the other half.

• Reflectional symmetry is a type of symmetry where one half of an object is a mirror image of the other half.

Select all that are true about a rhombus.

• 45° rotational symmetry

• 2 lines of reflectional symmetry

• 90° rotational symmetry

• 4 lines of reflectional symmetry

• point symmetry

What is rotational symmetry?

• An object changes its shape after a certain rotation.

• An object remains unchanged after a certain rotation.

• Rotational symmetry refers to the reflection of an object.

• Rotational symmetry is the ability of an object to rotate on its axis.

What is point symmetry?

• A type of symmetry where a figure remains unchanged when reflected across a line.

• A type of symmetry where a figure remains unchanged when rotated 90 degrees around a fixed point.

• A type of symmetry where a figure remains unchanged when rotated 180 degrees around a fixed point.

• A type of symmetry where a figure remains unchanged when rotated 360 degrees around a fixed point.

How many lines of symmetry does an equilateral triangle have?

• 4

• 3

• 2

• 1

What is the angle of rotation for a shape with rotational symmetry of order 3?

• 120°

• 60°

• 180°

• 90°

Which shape has point symmetry?

• isosceles triangle

• pentagon

• square

• rectangle

What is the angle of rotation for a shape with rotational symmetry of order 4?

• 45°

• 180°

• 90°

• 360°

A regular hexagon has (a)   lines of symmetry.

• 8

• 4

• 2

• 6
• 0

The angle of rotation for a shape with rotational symmetry of order 6 is (a)  

• 30°

• 90°

• 60°
• 120°