Posted by **chica** on Thursday, November 18, 2010 at 6:48pm.

Indirect Proofs

Prove a triangle cannot have 2 right angles.

1) Given triangle ABC.

2) Assume angle A and angle B are both right angles is true by one of two possibilities (it is either true or false, so we assume it is true)

This is my first time to do indirect proofs, so if someone can talk me through it so I can do the next problems by myself I would be greatful.

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