Explain why

Hello! What is your question? I will start off by giving the definition of an inscribed angle: an angle formed by two cords intersecting each other.

Sorry, the question seemed to have been cut off - it was "Explain why angles A and B are congruent"

https://imgur.com/a/QFFEfQG

Nevermind, it's because they both intercept the same arc CD. Thanks!