2-17.
In an isosceles triangle, the two angles opposite the congruent sides are called the
base angles. You may have learned in a previous course that the base angles of an
isosceles triangle are always congruent. Now you will prove it! In the diagram at
right, A SYM is an isosceles triangle, and point E is the midpoint of SM.

b. Would your proof work for any isosceles triangle? State your findings as an if-
then statement and add it to your Theorem Graphic Organizer.