In the following diagram the correctly marked angles are:


(a) ∠A and ∠e           (b) ∠i, ∠A and ∠D            (c) ∠A ∠r and ∠e             (b) ∠A ∠r and ∠D

Dear Student , 
Image result for prism angles
So option (i) will be correct here

Regards

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