similarity
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They are said to be similar shapes and have the same interior angles.
A figure that has both same size and shape is congruent.
Providing that they have the same angles they are said to be similar shapes
If they are the same shapes but differ only in size, then they are SIMILAR shapes. Otherwise, they are simply different shapes.
THere are many Different shapes and sizes of Virus' ... See here: http://en.wikipedia.org/wiki/Virus