Point, Line, and Rotational Symmetry

Point, Line, and Rotational Symmetry

Chapter 11

Lines of Symmetry

• The line of symmetry can be defined as the axis or imaginary line that passes through the center of the shape or object.

• It divides it into identical halves.

Multiple Choice

Does this image have a line of symmetry?

• Yes
• No

Multiple Choice

How many lines of symmetry does the flower have?

• 2
• 3
• 6
• 9

Multiple Choice

How many lines of symmetry does this shape have?

• 1

• 2

• 6

• 4

What Are Regular Polygons?

• A regular polygon is an n-sided polygon in which the sides are all the same length and are symmetrically placed about a common center. (Also Equal interior angles)

• Equilateral Triangle and Square

• Regular: Pentagon, Hexagon, Heptagon, Octagon, Nonagon, Decagon, .......

Multiple Choice

Determine whether the figure has line symmetry, rotational symmetry, both, or neither.

• Rotational

• Reflectional

• Both

• Neither

Multiple Choice

What is the angle of rotational symmetry?

• 360°
• 180°
• 120°
• 90°

Multiple Choice

What type of symmetry does this shape have?

• Only Rotational
• Only Line
• Both Rotational and Line
• Neither Rotational nor Line

Multiple Choice

Determine the angle of rotational symmetry for the figure.

• None

• 60°

• 120°

• 180°

Multiple Choice

How many lines of symmetry do a hexagon have?

• 5 lines

• 6 lines

• 7 lines

• 8 lines

Multiple Choice

What is the rotational symmetry for this figure?

• 180 degrees

• 90 degrees

• 60 degrees

• 30 degrees

Multiple Choice

Which letter has both point and line symmetry?

• N

• S

• Z

• H

Multiple Choice

Which letter has point symmetry?

• A
• S
• T
• W

Multiple Choice

Which letter does not have point symmetry?

• I
• O
• T
• S

Multiple Choice

Which of the following letters does not have a line symmetry, but has a rotational symmetry:

• H
• I
• Z
• X

Multiple Choice

How many lines of symmetry are there on an equilateral triangle?

• 0

• 1

• 2

• 3

Multiple Select

A rectangle has which of the following? (Choose all that are true.)

• 2 lines of symmetry

• 90 degree rotational symmetry

• 4 lines of symmetry

• 180 degree rotational symmetry