SOLUTION: How to prove that angle ABC=1 right angle?

Question 1087516: How to prove that angle ABC=1 right angle?
Found 2 solutions by Alan3354, ikleyn:
Answer by Alan3354(69443) (Show Source): You can put this solution on YOUR website!
Maybe you can't.
Answer by ikleyn(52932) (Show Source): You can put this solution on YOUR website!
.
There are probably 1000 of different situations and 1000 or 10000 ways to prove it . . .

The way how the post is formulated is NOT the way to present a Math problem or a Math question . . .

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