A right angle... I know that and I abhor math!
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An angle greater than 0 but less than 90 degrees is an acute angle
Perpendicular lines meet at 90 degrees
because a compliment means another angle to add up to 90 degrees, and an obtuse angle is more than 90 degrees, so therefore, a number over 90 plus another number cannot equal 90 degrees
Acute - less than 90 degrees Right - exactly 90 degrees Obtuse - more than 90 degrees but less than 180 degrees
Obtuse.