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Find .

What theorem was used to find these angles?Code:. . . - - - - * * * . . . * * . . . A o - - - - - - - o B . . . * \ / * . . . \ / . . . * \ / * . . . * * * . . . * / \ * . . . / \ . . . * / \ * . . . D o - - - - - - - o C . . . * * . . . * * *

The best we can say is: .

Theorem: An inscribed angle is measured by one-half its intercepted arc.