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Question and choices are in the photo please explain the answer

Question And Choices Are In The Photo Please Explain The Answer class=

Answer :

Answer:

51°

Step-by-step explanation:

Plain reasoning:

the arc of CD is 180°

78° is alrdy cut out for AB

the rest (102°) has to be equally decided between AC and BD

pls brainliest (although a second answer is needed to give the crown)