SOLUTION: What is the reason of angle 4 plus angle 2 equals 90?

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Question 661903: What is the reason of angle 4 plus angle 2 equals 90?
Answer by Alan3354(69443) About Me  (Show Source):
You can put this solution on YOUR website!
What is the reason of angle 4 plus angle 2 equals 90?
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Maybe they don't.