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Mathematics 7 Online
OpenStudy (riff-raff):

Is it A http://prntscr.com/ayitd7

OpenStudy (riff-raff):

@NekoMatt

OpenStudy (smartnerd1111):

u are correct

OpenStudy (xguardians):

A is correct, when two lines are perpendicular, they create 90 degree angles.

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