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Mathematics 7 Online
OpenStudy (anonymous):

http://openstudy.com/users/ganeshie8#/updates/5242ca66e4b0a03c277f5db5 @ganeshie8

ganeshie8 (ganeshie8):

ohh let me remind quick :)

ganeshie8 (ganeshie8):

The actual error was in applying the alternate interior angles theorem incorrectly. The student arrived at the conclusion that AB || CD because, he thought WZ adn XY are parallel, but they're not given as parallel. He **assumed** them to be parallel, which is a serious offense in geometry proofs.

ganeshie8 (ganeshie8):

which part is not making sense ? :)

OpenStudy (anonymous):

How did he apply it incorrectly?

ganeshie8 (ganeshie8):

|dw:1382506787466:dw|

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