Geomatry chpt 1 vocad Flashcards
acute angle
an angle that is greater the 0 degrees and less the 90 degrees
adjacent angles
angles that have a common side and common vertex
angle
2 rays with a common endpoint
angle bisector
a ray that divided an angle into 2 congruent angles
collinear points
points that lie on the same line
complementary angles
2 angles whose sum is 90 degrees
congruent angles
angles that have the same measure
congruent segments
segments that have the same length
coplanar points
points that lie on the same plane
definition
using known words to describe an unknown word
line
a one dimensional figure that extends forever in both directions
line segment
part of a line with two endpoints
( a line that has a dot on each side)
linear pair
2 adjacent angles which form a straight line
( pretty much 2 angles that make a line)
midpoint
a point that divides a segment into 2 congruent segments
obtuse angle
an angle that measures more than 90 degrees but less than 180 degrees
opposite rays
2 rays that have the same endpoint and go in opposite directions
plane
a flat surface that extends forever in 4 directions
point
a specific location in space
postulate
a mathematical statement that is accepted as true without proof
ray
a part of a line that starts an endpoint and extends forever in one direction
right angle
an angle that measures 90 degrees
segment bisector
a line, ray, segment or plane that divides a segment into 2 congruent segments
straight angle
an angle that measures 180 degrees
supplementary angles
2 angles whose sum is 180 degrees
vertical angles
2 angles whose sides form 2 pairs of opposite rays
(pretty much 2 lines crossing over each other and make an x)
