SOLUTION: angle ABD is a right angle .... what would be the reason or theorem for that?

SOLUTION: angle ABD is a right angle .... what would be the reason or theorem for that?

Algebra.Com

Question 386097: angle ABD is a right angle .... what would be the reason or theorem for that?
Answer by Alan3354(69443) (Show Source): You can put this solution on YOUR website!
look up the Pythagorean Theorem.

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