THere are many Different shapes and sizes of Virus' ... See here: http://en.wikipedia.org/wiki/Virus
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no
No. Congruent means the same shape and the same size. Two perfect circles would be the same shape but they might not be the same size.
no. congruent means the same size and shape. all triangles don't share the same size and shape.
That they all have the same shape and sometimes size
A square I think.