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Geometry 18 Online
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

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

Vocaloid (vocaloid):

third one?

OpenStudy (kittyloli):

Sorry, I read that it wrong and didn't see the negative symbol

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