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Mathematics 7 Online
OpenStudy (anonymous):

show that the diagonal of rhombus are perpendicular?

OpenStudy (anonymous):

http://www.geom.uiuc.edu/~ekeel/Project/area5.html

OpenStudy (anonymous):

so hwat i want is to show how is perpendicular?

OpenStudy (anonymous):

it crosses perpendicular lines cross, parallel lines don't

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