Geometry Flashcards
A coordinate system made by the intersection of the x-axis and the y-axis at the origin.
coordinate plane
the four sections of the coordinate plane
Quadrants
points that lie on the same line
Collinear
points that do not lie on the same line
Non-collinear
cannot be defined by using other figures; point, line, and plane
Undefined terms
indicates location
Point
a straight path that has no thickness and extends forever
Line
a flat surface that has no thickness and extends forever
Plane
the set of all points
Space
part of a line with two endpoints
line segment
points that lie on the same plane
Coplanar
A point where lines intersect.
Intersection
a statement that is accepted as true without proof
postulate
a²+b²=c²
Pythagorean Theorem
segments that have the same length
congruent segments
a point that divides a segment into 2 congruent segments
midpoint of a segment
a segment, ray, line, or plane that intersects a segment at its midpoint
segment bisector
A figure formed by two rays with a common endpoint
angle
90 degree angle
right angle
an angle that measures less than 90 degrees but more than 0 degrees
acute angle
An angle that measures more than 90 degrees but less than 180 degrees
obtuse angle
A part of a line, with one endpoint, that continues without end in one direction
Ray
two angles that have the same measure
congruent angles
a ray that divides an angle into two congruent angles
angle bisector
Lines that intersect to form 4 right angles
perpendicular lines
Two angles on the same plane that share a common side and have the same vertex
Adjacent angles
angles that do not share a common side and are not next to each other
non-adjacent angles
two nonadjacent angles formed by two intersecting lines
vertical angles
two adjacent angles whose bottom sides make a line
linear pair
Two angles whose sum is 180 degrees
supplementary angles
Two angles whose sum is 90 degrees
complementary angles
