it isn't because its a kind of nature.
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radial symmetry, i am trying to find the reason now!
An equilateral triangle has both line symmetry and rotational symmetry. A non-equilateral isosceles triangle has line symmetry but not rotational symmetry. A scalene triangle has neither kind of symmetry.
A real tree usually has none.
According to animal classification into bilateria and radiata (ACCORDING TO SYMMETRY)the echinoderms and molluscs are bilaterally symmertrical.
The letters H and Z have both line symmetry and rotational symmetry