Which of the following completes the proof?

triangles abc and edc are formed from segments bd and ac, in which point c is between points b and d and point e is between points a and c.

given: segment ac is perpendicular to segment bd

prove: δacb ~ δecd

reflect δecd over segment ac. this establishes that then, this establishes that ∠e'd'c' ≅ ∠abc. therefore, δacb ~ δecd by the aa similarity postulate.

∠abc ≅ ∠e'd'c'; translate point e' to point a
∠acb ≅ ∠e'c'd'; translate point e' to point b
∠acb ≅ ∠e'c'd'; translate point d' to point b
∠abc ≅ ∠e'd'c'; translate point d' to point a