angle relation ships
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obtuse
angle greater than 90 degrees
acute
angle less than 90 degrees
Alternet interior angles
inside the parallel lines and on opposite sides of the transversal
parallel lines
lines in the same plane that never intersect
transversals
lines that intersect two or more lines to create angles
Alternate exterior angles
outside the parallel lines and on opposite sides of the transversal
corresponding angles
the angles that occupy the same relative position at each intersection where a straight line crosses two others. If the two lines are parallel, the corresponding angles are equal.