Draw an isosceles triangle, the base is AB. Stretch the base of two segments such that AD is congruent to BE. [br]Prove that :[br]1) [math]\bigtriangleup[/math]CAD[math]\simeq[/math] [math]\bigtriangleup[/math]CBE [br]2) [math]\bigtriangleup[/math]DEC is an isosceles triangle.[br][br][br][br]