Click on the blue point and drag it to change the figure.
In a full circle, how many times the the red star lay exactly on top of the black star?
 Manipulative 1  Radial Symmetry of a Five Pointed Star Created with GeoGebra. 

A geometric object has radial symmetry if it has
congruent
parts radiating out from a central point. The fivepointed star in figure 1 has radial
symmetry. Each of the points is identical to the other points. All of the points extend
out the same way from the central point. Another way to think of radial symmetry, involves
rotating the object around the central point. If the object is rotated by any angle other than a
full circle and lies exactly on top of the preimage, then the object has radial symmetry.
Objects that are radially symmetric can differ on how many points of symmetry they have.
The star in figure 1 has 5 point radial symmetry. In nature, there are many plants and animals that have
3 point, 5 point, 6 point and 8 point symmetry. Some of these are shown in the table below.
