What is the formula for prespective?

It is really annoying guessing. I need the following:-Formula in words-Pictures-2 examples-Does it work for 2pt prespective?-No confusing words withou

It is really annoying guessing. I need the following:
-Formula in words
-Pictures
-2 examples
-Does it work for 2pt prespective?
-No confusing words without explanations
-Words like orthographic and planometric are accepted
Please dont make it complicated for my young mind thanks.

or:It is really annoying guessing. I need the following:-Formula in words-Pictures-2 examples-Does it work for 2pt prespective?-No confusing words without explanations-Words like orthographic and planometric are acceptedPlease dont make it complicated for my young mind thanks.

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