Rotation

"Rotation" means turning around a center:

The distance from the center to any point on the shape stays the same.

Every point makes a circle around the center:

Here a triangle is rotated around the point marked with a "+"

Try It Yourself

Here you can drag the pin and try different shapes:

And here you can choose an angle and see how to rotate different shapes point-by-point. Try and follow what happens each time: