Unit One Vocab Flashcards
location with no size or shape
point
made up of points with no thickness or width
line
measurable part of a line consisting of two endpoints
line segment
line that extends indefinitely in one direction
ray
flat surface made up of points and extends indefinitely in all directions
plane
points that lie on the same line
collinear
points that do not lie on the same line
non-collinear
points that lie on the same plane
coplanar
points that do not lie on the same plane
non-coplanar
two segments with the same length
congruent segments
if A, B, and C are collinear points and B is between A and C, then lines AB + BC = AC
SEGMENT ADDITION
POSTULATE
The formula used to find the distance between two points on a coordinate plane
DISTANCE FORMULA
The formula used to find the midpoint between two endpoints
MIDPOINT FORMULA
A segment, line, or plane that intersects a segment at its midpoint
SEGMENT BISECTOR
Two lines that intersect at a 90° angle (right angle). Symbol: ⊥
PERPENDICULAR
A line, segment, or ray perpendicular to a segment
at its midpoint
PERPENDICULAR BISECTOR
Two lines that never intersect Symbol: ll
PARALLEL LINES
The intersection of two rays
at an endpoint.
ANGLE
The common endpoint of an angle. (where the sides intersect)
VERTEX
An angle with a degree measure of 90°.
RIGHT ANGLE
An angle with a degree. measure less than 90°.
ACUTE ANGLE
An angle with a degree measure greater than 90°.
OBTUSE ANGLE
An angle with a degree measure of 180°.
STRAIGHT ANGLE
Two angles that have the same measure
CONGRUENT ANGLES
Two angles that share a common side and vertex. “Next to” each other.
ADJACENT ANGLES
If <ABD and DBC are adjacent, then <ABD + < DBC = LABC.
ANGLE ADDITION POSTULATE
A line or ray that divides an angle into two equal parts.
ANGLE BISECTOR
Two angles directly across from each other on intersecting lines. *Always Congruent. *
VERTICAL ANGLES
Two angles with measures that
Sum to 90° * Do not have to be adjacent. *
COMPLEMENTARY ANGLES
Two angles with measures that Sum to 180°. * Do not have to be adjacent.*
SUPPLEMENTARY ANGLES
Adjacent angles that are Supplementary. Combined, they form a straight line.
LINEAR PAIR
