Parallel Lines two or more lines that run in either direction and never cross Parallel lines are lines in a plane that never intersect or cross each...
Perpendicular Lines two or more lines that cross at right angles Perpendicular lines are two lines that intersect each other at a 90-degree angle. This intersection point...
Obtuse Angle an angle that measures between 90 degrees and 180 degrees An obtuse angle is an angle that measures greater than 90 degrees but less than...