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See post#4 for info re setting Window's PATH variable.

What was the result of the javac step?
Where did you get the Area.class file?
The Area.class is not from the compiler. If you open it in an editor it starts with the letters: impo
Rename it out of...

If you have the JDK installed on your computer, you need to tell the OS where it java tools are located.
If you don't have the JDK, you need to download and install it.

To tell the OS where the...

How do you compile the program? Do you use the javac command?
If so, if there are no errors, the javac command will create a .class file: Area.class for your program.

To execute the program, open...