Question Number 189894 by Rupesh123 last updated on 23/Mar/23
Answered by HeferH last updated on 24/Mar/23
$$\mathrm{congruent}\:\mathrm{chords}\:\mathrm{hold}\:\mathrm{congruent}\:\mathrm{arcs}: \\ $$$$\angle\mathrm{CED}\:=\:\mathrm{100}°/\mathrm{2}\:=\:\mathrm{50}° \\ $$