In the triangle BDC we have
In the triangle ADC we have
I have this Geometry problem here which is a proof question.
I am really unsure of where to start, but I have been told by the teacher that using congruent triangles might help, but does that mean I will need to draw in a line onto the diagram? I'm not quite sure where to start.
1. Triangles DEC, DAC are congruent.
2. Angle DEC = angle DAC = 2× angle DBE.
3. Triangle BDE is isosceles.
4. BE = DE = DA.
5. BC = BE + EC = AD + AC.