Nov. 27 1997 Homework
Definition: Isosceles triangleA triangle in which two sides have the same length.
GivenDABC is an isosceles triangle with side AB @ side BC.
GivenDABC, Ray AD bisects BAC, Ray CD bisects BCA, Line EF is parallel to segment AC and passes through D.
Prove thatDADE and DCFD are isosceles.