Symmetry in Shapes and Figures

This video tutorial introduces the concept of axial symmetry, explaining that a shape is symmetrical if it can be divided into two identical halves by a line, known as the axis of symmetry. Various examples, such as squares and triangles, are used to illustrate how shapes can have multiple axes of symmetry, including vertical, horizontal, and diagonal lines. The video also covers the concept of reflection in a line, or mirror line, and includes an activity to practice identifying images under axial symmetry. The tutorial concludes with contact information for further study.

What is the term used for a line that divides a shape into two reflective halves?

• Axis of rotation

• Axis of symmetry

• Mirror axis

• Line of division

Tags

CCSS.4.G.A.3

Which of the following shapes is symmetrical if a line is drawn through its middle?

• All of the above

• Circle

• Rectangle

• Triangle

Tags

CCSS.4.G.A.3

If a shape can be folded over a line and both halves match perfectly, what is this line called?

• Folding line

• Reflection line

• Symmetry line

• Axis of symmetry

Tags

CCSS.4.G.A.3

How many axes of symmetry does a square have?

• Three

• Four

• One

• Two

Which of the following is NOT an axis of symmetry for a square?

• Diagonal

• Horizontal

• Vertical

• Circular

Tags

CCSS.4.G.A.3

What is another term for the dotted line used to show symmetry in a figure?

• Mirror line

• Central line

• Axis of rotation

• Dividing line

Tags

CCSS.4.G.A.3

What happens to a figure when it is folded along its mirror line?

• It disappears

• It changes shape

• It overlaps perfectly

• It becomes distorted

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CCSS.8.G.A.3

CCSS.HSG.CO.A.5

In the activity, what is the image of point A when folded over the dotted line?

• Point B

• Point D

• Point H

• Point E

Tags

CCSS.4.G.A.1

When the line segment AB is folded over the dotted line, which line segment does it fall on?

• Line segment IJ

• Line segment CD

• Line segment HG

• Line segment EF

Tags

CCSS.4.G.A.1

Which line segment does BC fall on when folded over the dotted line?

• Line segment IJ

• Line segment DE

• Line segment FG

• Line segment GH

Tags

CCSS.4.G.A.1