Preview 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 . Homework Help
E
M M
Make a flowchart to prove that the base angles of A SYM are congruent, that is, prove that ZS – ZM.