HOW TO FIND HYBRIDISATION OF AN ELEMENT IN COMPOUND IF IT HAS MORE THAN ONE CENTRAL ATOM?

in the case of organic compounds how do u calculate the hybridisation

if around the carbon all the bonds are sigma bonds then the hybridisation is sp3

if around the carbon at least one double bond is present then the hybridisation is sp2

if around the carbon the triple bond  is present then the hybridisation is sp

for example :- in the case of methane all the bonds are sigma bonds then the hybridation is sp3

but in the case of ethylene molecule there is a double bond in b/w two carbons each carbon possess sp2

but in the case of acetylene molecule there is a triple bond in b/w two carbons each carbon possess sp

thank u

khaja