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OpenStudy (kittyloli):
If A(x1, y1), B(x2, y2), C(x3, y3), and D(x4, y4) form two line segments, AB and CD , which of these conditions needs to be met to prove that AB is perpendicular to CD? http://assets.openstudy.com/updates/attachments/55b288c0e4b071e6530de34b-crane2016-1437763868834-geo.jpg
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OpenStudy (kittyloli):
@Vocaloid
Vocaloid (vocaloid):
product of the slopes should be -1
OpenStudy (kittyloli):
I know, but like... It's not one of the options
OpenStudy (kittyloli):
OH WAIT YES IT IS
Vocaloid (vocaloid):
good
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Vocaloid (vocaloid):
third one?
OpenStudy (kittyloli):
Sorry, I read that it wrong and didn't see the negative symbol
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