Shapes and Symmetry

Shapes and Symmetry

​Unit 8

• Identifying the symmetry of 2D shapes

• ​Circles and polygons

​8.1 Recognising Line and Rotational Symmetry

​Challenge...

​Find an object around you that has line symmetry, and show it to your camera!

Multiple Choice

How many lines of symmetry does the butterfly have?

• 1
• 2
• 3
• 4

Multiple Choice

How many lines of symmetry does this shape have?

• 0
• 1
• 2
• 4

Multiple Choice

How many lines of symmetry does this trapezoid have?

• 0
• 1
• 2
• 3

Multiple Choice

How many lines of symmetry does this shape have?

• 0
• 1
• 2
• 4

Multiple Choice

How many lines of symmetry does this shape have?

• 2
• 4
• 6
• 8

​8.1 Recognising Line and Rotational Symmetry

Multiple Choice

Find the order of rotational symmetry in this shape.

• 1

• 2

• 3

• 4

Multiple Choice

Find the order of rotational symmetry in this shape.

• 2

• 3

• 4

• 5

Multiple Choice

Find the order of rotational symmetry in this shape.

• order 3

• order 2

• order 1

• no order of rotation

Multiple Choice

What is the order of rotational symmetry of the shape?

• 3

• 2

• 1

• 0

Multiple Choice

Which of these shapes has rotational symmetry of order 2?

• square

• isosceles triangle

• parallelogram

• kite

​8.2 Circles and Polygons

​8.2 Circles and Polygons

​8.2 Circles and Polygons

Multiple Choice

Which segment is the diameter?

• AC
• BD
• LM
• CE

Multiple Choice

Which segment is a radius?

• LM
• DC
• BD
• ML

Multiple Choice

If you are given the diameter, how can you calculate the radius?

• Multiply the diameter by 2
• Divide the diameter by 2
• Add 2 to the diameter
• Subtract 2 from the diameter

Multiple Choice

The distance across a circle through its center is called the _____.

• diameter
• radius
• π
• center

Multiple Choice

What is a polygon?

• A closed plane figure made up of line segments
• An open plane figure made up of line segments
• A closed plane figure made up of rays
• An open plane figure made up of rays

Multiple Choice

How many sides do I have?

• 5
• 6
• 4
• 7

Multiple Choice

A chord is a line that:

• goes from the center to the edge of the circle

• can not go through the center of the circle

• connects two points on the circumference

• divides a diameter into two parts

Multiple Choice

Which of these properties is common to squares and rectangles?

• All sides are equal

• 4 lines of symmetry

• Rotational symmetry of order 2

• All angles are equal

Multiple Choice

The circumference of a circle is its...

• perimeter

• diameter

• rad

• chord

Multiple Select

A regular octagon has eight sides.

Choose all correct statements about a regular octagon.

• A regular octagon has eight lines of symmetry.

• A regular octagon has four different angles.

• The angles on regular octagon add to 360°.

• A regular octagon has rotational symmetry of order 8.