I've installed angular cli but its showing not recognized in cmd

Actually I've installed Nodejs, then npm, then angular cli properly (afaik). But in windows cmd and in git bash, its showing "ng --version" as:

ng is not recognized as an internal or external command, operable program or batch file.

from windows command prompt

from github bash

but when i try this command with node command prompt, it showing the ng version.

Because of this, i cannot use ng serve. Also i've tried to install bower and gulp. Getting the same "not recognised" error for both of them. Help to solve this.

Thanks and Regards, sharfudeen