We will be creating two triangles: Triangle ABC and Triangle CDE
From the two figures drawn above, Triangle ABC is similar to Triangle CDE
Line AB = Line DE
Line BC = Line DC
Line AC = Line CE
< D is equal to 90 degrees and this is similar to angle B
Hence, < D = < B
Also, triangle similarity proportion can be establish
[tex]\frac{AB}{DE}\text{ = }\frac{BC}{DC}\text{ = }\frac{AC}{CE}[/tex]
