4.1-4.3 Symmetry Review

Front

What is symmetry in geometry?

Back

Symmetry in geometry refers to a balance or correspondence between two halves of a shape, where one half is a mirror image of the other.

Front

What is a line of symmetry?

Back

A line of symmetry is an imaginary 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

How many lines of symmetry does a square have?

Back

A square has 4 lines of symmetry.

Front

What is rotational symmetry?

Back

Rotational symmetry is when a shape can be rotated around a central point and still look the same at certain angles.

Front

How many degrees can a shape with rotational symmetry be rotated before it looks the same?

Back

The degrees depend on the shape; for example, a square has rotational symmetry at 90 degrees, while a regular pentagon has it at 72 degrees.

Front

Does a trapezoid have rotational symmetry?

Back

No, a standard trapezoid does not have rotational symmetry.

Front

How many lines of symmetry does an equilateral triangle have?

Back

An equilateral triangle has 3 lines of symmetry.

Front

What is the relationship between lines of symmetry and the number of sides in a regular polygon?

Back

In a regular polygon, the number of lines of symmetry is equal to the number of sides.

Front

Can a shape have both line symmetry and rotational symmetry?

Back

Yes, a shape can have both line symmetry and rotational symmetry, such as a square.