Angles that cross are called perpendicular angles.
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An angle is formed when two lines meet (or cross). The vertex is the point where the lines meet.An angle is formed when two lines meet (or cross). The vertex is the point where the lines meet.An angle is formed when two lines meet (or cross). The vertex is the point where the lines meet.An angle is formed when two lines meet (or cross). The vertex is the point where the lines meet.
Not only that; to be "perpendicular", they have to cross at an angle of 90 degrees.
When two perpendicular lines cross, a right angle is formed.
An angle less then 90° is called an acute angle.
A angle that measures more than 180 degrees is called a REFLEX ANGLE.