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Question: ∠1 and ∠3 are vertical angles and ∠1 is a right angle as shown. Prove that ∠3 is a right angle by flow proof.




Steps to derive

1 Given: ∠1 is a right angle and ∠1 and ∠3 are vertical angles as shown.
 [Figure.]

2 Prove: ∠3 is a right angle.

3 The flow proofs is as follows.




Hence the right answer is Option

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