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Mathematics 63 Online
OpenStudy (anonymous):

Amanda is writing a proof for the theorem stated below. Theorem: The sum of interior angles of a triangle is 180°. She first drew the figure shown below. Which theorem will she most likely use in the proof? Supplements of congruent angles are congruent. If two angles of a triangle are congruent, the sides opposite these are congruent. All straight angles are congruent. Corresponding angles formed by parallel lines and their transversal are congruent.

OpenStudy (anonymous):

I think it's either the second or fourth one..

OpenStudy (anonymous):

hmmm....

OpenStudy (anonymous):

this one is a little more tricky

OpenStudy (anonymous):

my guess is Alternate interior angles formed by parallel lines and their transversal are congruent but u don't have that as an answer

OpenStudy (anonymous):

Isn't that D?

OpenStudy (anonymous):

ya it would be ;D

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