Lines of Symmetry

Front

What is a line of symmetry?

Back

A line of symmetry is a line that divides a shape into two identical parts that are mirror images of each other.

Front

How many lines of symmetry does a circle have?

Back

A circle has an infinite number of lines of symmetry.

Front

What is the line of symmetry for a rectangle?

Back

A rectangle has two lines of symmetry: one vertical and one horizontal.

Front

How many lines of symmetry does a square have?

Back

A square has four lines of symmetry.

Front

What is the line of symmetry for an equilateral triangle?

Back

An equilateral triangle has three lines of symmetry.

Front

Can a shape have no lines of symmetry? Give an example.

Back

Yes, a shape can have no lines of symmetry. An example is a trapezoid.

Front

What is the relationship between lines of symmetry and congruence?

Back

Lines of symmetry indicate that the two halves of a shape are congruent.

Front

How do you determine the number of lines of symmetry in a polygon?

Back

To determine the number of lines of symmetry in a polygon, look for lines that can divide the shape into two identical halves.

Front

Is a line of symmetry always vertical or horizontal?

Back

No, a line of symmetry can be at any angle, not just vertical or horizontal.

Front

What is the line of symmetry for a regular pentagon?

Back

A regular pentagon has five lines of symmetry.