Beth wants to prove that the measures of the
interior angles of a triangle have a sum of 180
degrees. She draws triangle ABC and then a line
parallel to side AB, as shown in the diagram below.
C
3 4 5
A
1
A
2
B
Select all of the statements that must be true and
could be used as part of Beth's proof.



HELP I NEED TO GET MY GRADE UP BY SATURDAY