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earthgrl_5
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parallel lines
dont intersect

transversal
line that intersects the parallel lines

interior angles
angles inside of parallel lines

exterior angles
angles outside of parallel lines

alternating interior angles
interior angles; on opposite sides of the transversal and both inside the parallel lines (3,5); same number of degrees

alternating exterior angles
exterior angles; on opposite sides of the transversal and both outside the parallel lines (1,7); same number of degrees

corresponding angles
in the same position on the parallel lines in relation to the transversal (1,5); same number of degrees

perpendicular lines
intersect in form of "plus sign" and form right angles

vertical angles
intersect in form of "x" (numbered clockwise starting on left 1=3, 2=4)

adjacent angles
next to each other (measure of largest angles=measure of first angle + measure of second angle)

