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Please help with math question below

Please help with math question below-example-1
User Casablanca
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2 Answers

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i am pretty sure its qt 
User Squig
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Edges that are perpendicular to PR basically means what edges make a 90° angle with PR.

Those edges are HP , RA, TR and QP.

Hence, the answer is A, B and C.
User Axazeano
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