SOLUTION: What is the reason of angle 1 plus angle 3 plus 90 equal 180?

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Question 661893: What is the reason of angle 1 plus angle 3 plus 90 equal 180?
Answer by Alan3354(69443) About Me  (Show Source):
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What is the reason of angle 1 plus angle 3 plus 90 equal 180?
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Where are angle 1 and angle 3?