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29 Cards in this Set

  • Front
  • Back
point
think of it as a location; has no size; named with a single letter
line
think of it as a series of points that extends in opposite directions without end; named with two letters with a line above them
space
the set of all points
plane
think of it as a flat surface with no thickness; extends forever; named with three letters
collinear points
points that are on the same line
coplanar
lines or figures in the same plane
postulate
an accepted statement of fact
axiom
same as postulate
segment
part of a line consisting of two endpoints and all of the points between them; named using the two endpoints
ray
past of a line consisting of one endpoint and all of the points of the line on one side of the endpoint, named using the endpoint and one other point on the ray
opposite rays
two collinear rays with the same endpoint, they form a line
parallel lines
coplanar lines that never intersect; the symbol for parallel to is ||
skew lines
noncoplanar lines, NOT parallel and NEVER intersect
parallel planes
planes that do not intersect
coordinate
the distance and direction from zero
congruent segments
segments with the same lengths
midpoint
point that divides the segment into two congruent segments
angle
two rays with the same endpoint, named by three points on the angle with the vertex letter in the middle or just the vertex
acute angle
an angle whose measure is less than 90
right angle
an angle whose measure is 90
obtuse angle
an angle whose measure is between 90 and 180
straight angle
an angle whose measure is 180, a line
congruent angles
angles with the same measure
construction
using a straightedge and a compass to draw a geometric figure
straightedge
ruler with no markings on it
compass
tool used to draw circles
perpendicular lines
two lines that intersect to form right angles, symbol for perpendicular is *upside-down T*
perpendicular bisector
a line, segment or ray perpendicular to a segment at its midpoint
angle bisector
a ray that divides an angle into two congruent angles, endpoint is at vertex