###
acute angle

angles that measures less than 90 degrees

###
right angle

angle that measures exactly 90 degrees

###
obtuse angle

angle that measures more than 90 degrees, but less than 180 degrees

###
straight angle

angle that measures exactly 180 degrees

###
complementary angles

sum of the measure of two angles is 90 degrees

###
supplementary angles

sum of the measure of two angles is 180 degrees

###
vertical angles

opposite angles formed by two intersecting lines

###
perpendicular lines

two intersecting lines that form 90 degree angles

###
parallel lines

lines that never intersect

###
skew lines

do not intersect and not parallel - they are in different planes

###
adjacent angles

formed by two intersecting lines, angles that are next to each other

###
transversal

line that intersects two or more lines

###
corresponding angles

on the same side of the transversal and are both above (or both below) the parallel lines

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