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13 terms

Math test Angles, lines, similar, congruent

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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