A cello is different not just because how it looks and how big it is, it also sounds different. It has a deeper tone than a violin or viola due to its larger body and thicker strings. Cellos are also generally more expensive than violins or violas.
You hold a cello between your knees, whereas you hold a viola/violin between your chin and shoulder.
The 'cello is larger than the viola, which is larger than the violin.
ViolinViolaCelloBass
1st violin 2nd violin Viola Cello
Typically a string quartet is two violins, one viola, one cello.
The cello.
viola
violin, viola cello, bass
A cello can play in the range of a violin (much of it), if that's what you mean, but a violin's highest note is much higher than a cello's highest note.
Violin,cello,double bass ,viola,ect
A viola is a string instrument of the violin family. It is larger than a violin but smaller than a cello, and like the violin and cello it is played with a bow.
The viola is both larger than the violin and smaller than the cello.