
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. 
#  A  B  C  D 
E  F  G  H  I 
J  K  L  M  N 
O  P  Q  R  S 
T  U  V  W  Y 
Z  X 
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