Describe the main parts of a proof.

In a 2-column proof, the main parts include:

The given - This is what the problem gives you to start off with

The prove/conclusion - This is what the problem asks you to prove with the proof

The statements - These are the parts that you put in the first column that you will later prove.

The reasons - These are the ways you know that the things you put in the statements are true

The diagram - It may not always be given, but it is basically the image that you are proving.