spirilla (spiral) bacilla (rod) and cocci (spherical) :) happy i could answer this one!
I'm going to give the nonscientific answer, a bacteria can only maintain one shape because it don't have enough cells to mold into another shape there for it is not multicellular (or it is I think it depends on if its arche or EU bacteria).
A 4 sided shape has 4 vertices whereas a 3 sided shape has 3 vertices.
3-D Shape
Wich 3 D shape has a corner on it?
A triangle as no other 2d shape can have 3 sides.
The bacteria that can change shape call pleomorphic
Coccus(Round shape), Bacillus(Rod shape), Spiral bacteria(Motile bacteria having a helical or spiral shape) By Arcangel Meynard
There are 3 ways according to shape - rod, round, or spiral.
cocci bacteria are round in shape
The spacecraft shape
Streptococcus, the bacteria that causes strep throat, is spherical (cocci) in shape.
Round bacteria are cocci.
Bacilli are rod-shaped bacteria.
MreB is the most common one, and gives bacteria their tubular form. Then there is Crescentin, which is involved in formation of the crescent shape of some bacteria.
Their size.
It is cdsd
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