Question 696657: i dont understand how to do a 2 column proof or what to write inside the 2 column proof. can you help me?
Answer by MathLover1(20850)   (Show Source):
You can put this solution on YOUR website! A proof is just an orderly way to show that something is
true, by building on other things   are  .
The only way that   is that each thing you say  be based on something you've   . Often it will be based on the previous statement,
but sometimes you will have to use earlier statements as well.
Your " " are the foundation someone laid for you, and the  ,  , and  you have to use to put together to a final goal, a 
for example:
.Statements .......................... Reasons
1. AB = CD ...................... given
2. BC = BC ...................... reflexive property
3. AB + BC = BC + CD ........ addition property of equality
4. A-B-C-D ........................ given
5. AC = AB + BC ................ definition of between
6. AC = BC + CD ................ transitive property of equality
7. BC + CD = BD ............. definition of between
8. AC = BD ......... transitive property of equality
so, here is the foundation at the bottom  ,and the goal at the top 
statement 2 gives you a new fact you can build on that doesn't depend on
the givens, but has been applied to a specific value, BC
statement 3 uses statements 1 and 2, by adding them together 
statement 4 is a given
statement 5 uses its definition
................
...................|
..... / ....... \
....... 2 ....... 1
..... / .......... \
 
and you get 
statement 7 is again based on the definition of between of statement 4
finally we can join statements 6 and 7 to get to the goal which is 
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