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What is Rotational Symmetry? - Definition & Examples Video

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  • 0:01 What is Rotational Symmetry?
  • 0:57 What is the Center of…
  • 1:16 What is Order of Symmetry?
  • 2:03 What is Degree of Rotation?
  • 3:07 Lesson Summary
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Lesson Transcript
Instructor: David Karsner
If you have ever tried to hang a picture and not been able to tell which end was up, then your picture might have had rotational symmetry. Rotational symmetry is the characteristic that makes an object look the same even after you've rotated it.

What is Rotational Symmetry?

The recycling icon is a very common symbol, and like most effective icons, the image itself is suggestive of its meaning. The arrows of the image appear to be moving in a circular manner, suggesting the circular concept of recycling. Adding to this perception is that if you were to rotate the image 120 degrees, and another 120 degrees, and a third 120 degrees, it would look the same at all three stops.

This attribute is called rotational symmetry. Many shapes have rotational symmetry, such as rectangles, squares, circles, and all regular polygons. Choose an object and rotate it up to 180 degrees around its center. If at any point the object appears exactly like it did before the rotation, then the object has rotational symmetry. In this lesson, you will be given several image examples, as well as definitions of the relevant concepts center, order, and degree of rotation.

What is the Center of an Object?

The center of a shape or object with rotational symmetry is the point around which the rotation occurs. If one was to spin a basketball on the tip of his finger, the tip of his finger would be the center of the rotational symmetry. If an object has rotational symmetry, its center will also be its center of balance.

Order of Symmetry

The order of symmetry - or for short, order - is the number of times an object or shape can be rotated and still look like it did before rotation began. Let's look at some examples.

Rotational symmetry with 180 degrees of rotation
Hexagon

Here we have a hexagon. It has an order of 2. Let's look at another example.

Rotational symmetry with two rotations of 72 degrees
BlueOrange
Rotational symmetry with 72 degrees of rotation
Starfish

Both the blue and orange shape and starfish have an order of 5 because you can turn them 5 times and they still look the same as they did before they were rotated.

Let's look at one more example.

Rotational symmetry with 120 degrees rotation
triangle

This one has an order of 3.

The smallest order would be an order of 2. You cannot have a shape or object that has an order of 1. An order of 1 would mean that you can complete a full rotation without it appearing as it did before the rotation. In other words, an order of 1 would mean that is has no rotational symmetry.

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