Block, SkipCaptcha, nsAm_Govt_101RO, nsAm_Govt_101RW, nsAm_Govt_101_ta, nsTeam2RO, nsTeam2RW, nsTeam2_talkRO, nsTeam2_talkRW
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Changes
New page: '''Perpendicular lines''' are lines which intersect to form four <math>90^o</math> angles.
'''Perpendicular lines''' are lines which intersect to form four <math>90^o</math> angles.