connections between amino acids

Peptide  bond  is formed between carboxyl group of one amino acid and the amino group of the next one with the loss of one water molecule.It's the dehydration process we know.The number of amino acids  in proteins are indicated by Dipeptide,Tripeptide and Polypeptide.

Dipeptide: is when 2 amino acids connect to each other 
For example

Amino acid(1)+Amino acid(2)=Dipeptide+ water

Tripeptide:is when 3 amino acids connect to each other
For example

Amino acid(1)+Amino acid(2)+Amino acid(3)=Tripeptide+ 2 water

Polypeptide:is when more then 3 amino acids connect to each other
For example

A.a+A.a+A.a+A.a=Polypeptide+3 water