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Mathematics 19 Online
OpenStudy (jennifer.ramireezzzz):

AB is the perpendicular to CD. How many 90 angles are formed by the intersection?

OpenStudy (vuriffy):

Is it like this?

OpenStudy (vuriffy):

|dw:1478057681357:dw|

Nnesha (nnesha):

|dw:1478058316644:dw|

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