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Mathematics 13 Online
OpenStudy (anonymous):

Help. Attached.

OpenStudy (anonymous):

OpenStudy (phi):

I draw a picture to help jog my memory |dw:1355776877736:dw|

OpenStudy (phi):

I know if they are congruent the lines are parallel, and all the other angles (if matched up correctly) are congruent. See http://www.mathsisfun.com/geometry/alternate-interior-angles.html

OpenStudy (phi):

The only ones that are not equal is choice (d). interior angles on the same side (NOT alternate) add up to 180. I think that is called supplementary.

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