Amines are the alkyl (or) aryl derivatives of NH3. The general formula of amine is R3N, where R is an alkyl (or) aryl group or hydrogen.
In amines one or more Hydrogen atoms of ammonia are replaced by Alkyl or aryl groups. Here nitrogen atom of amines is like that of NH3, it is sp3 hybridised. The three Alkyl groups (or hydrogen atoms) occupy corners of a tetrahedron, one of sp3 orbital occupying the unshared electron pair directed towards the other corner. We say shape of amine as “Trigonal Pyramidal”.