galactus
Jun 4, 2010, 11:31 AM
Here is an example of a two-column proof. Please excuse any errors. I was concentrating on just showing what a two-column proof is, and getting the LaTex to work:)
Prove Isosceles Triangle Theorem.
Prove \overline{AC}\equiv \overline{BC}
\begin{array}{c|c}\text{Conclusions}&\text{Justifications}\\ \hline {\Delta} CAB\equiv {\Delta}CBA&\text{SAS Postulate}\\ \overline{AC}\equiv \overline{BC}&\angle A\equiv \angle B\\ {\Delta}CAB \equiv {\Delta}CBA&\text{ASA Theorem}\\ {\therefore} \overline{AC}\equiv \overline{BC}& \;\ \end{array}
Prove Isosceles Triangle Theorem.
Prove \overline{AC}\equiv \overline{BC}
\begin{array}{c|c}\text{Conclusions}&\text{Justifications}\\ \hline {\Delta} CAB\equiv {\Delta}CBA&\text{SAS Postulate}\\ \overline{AC}\equiv \overline{BC}&\angle A\equiv \angle B\\ {\Delta}CAB \equiv {\Delta}CBA&\text{ASA Theorem}\\ {\therefore} \overline{AC}\equiv \overline{BC}& \;\ \end{array}