Studied by 4 people
collinear
two or more points that lie on the same line
line segment
a subset of a line consisting of two endpoints and all points between them
midpoint of a segment
To a point on a line segment that divides it into two equal lengths
segment bisector
a line that intersects a line segment at its midpoint
ray
a subset of a line consisting of one endpoint and all points to one side
opposite rays
two rays with a common endpoint that point in opposite directions to form a line
angle
two rays with a common endpoint
vertex
the common endpoint of two rays
interior of an angle
all points lying between two rays in an angle
adjacent angles
two angles sharing a common vertex and a common ray between them
linear pair
adjacent angles whose non-common rays form opposite rays
vertical angles
a pair of non-adjacent angles formed by the intersection of two lines
angle bisector
a line that divides an angle into two angles of equal measure
acute angle
an angle whose measure is greater than 0° and less than 90°
obtuse angle
an angle whose measure is greater than 90° and less than 180°
right angle
an angle whose measure is 90°
reflex angle
an angle whose measure is greater than 180°
straight angle
an angle whose measure is 180°
complementary angles
two angles whose measures sum to 90°
supplementary angles
two angles whose measures sum to 180°
perpendicular lines
two lines that intersect to form angles that measure 90°
perpendicular bisector
a line that intersects a line segment at its midpoint and is perpendicular to the line segment
congruent
two objects with equal lengths and/or equal angle measures
Note 
Flashcard (68)