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Question: Write the first step of an indirect proof of the following statement:
∠A is not a right angle.


A ) assume ∠A is an acute angle
B ) assume ∠A is an obtuse angle
C ) assume ∠A is not a right angle
D ) assume ∠A is a right angle

Steps to derive

1 In the first step of an indirect proof, we always assume the opposite of what is to be proved.

2 So, Assume ∠A is a right angle.
 [Step 1.]



Hence the right answer is Option D

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