definitions
point
Marks an exact location in space.
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closed figures
Shapes that Start and stop in same place
obtuse
An angle with a measure of less more than 90 degrees but less than 180 degrees
complinentary angles
Two side by side angles whose sum adds up to 90 degrees
endpoints
The point that marks the end of a line segment of beginning point of a ray
ray
Is part of a line that has one endpoint and goes on forever in one direction
A closed figure made up of line segments that do not cross over each other
straight angles
An angle with a measure of 180 degrees
supplematary
Two side by side angles that adds up to 180 degrees
line segment
Part of a line between two endpoints and it has a definite length
vertex
The point where two sides meet
regular polygon
sided polygon in which the sides are all the same length and are symmetrically placed about a common center
reflex angles
An angle with a measure of greater than 180 degrees but less than 360
intersecting lines
Lines that meet or cross at a common point
line
Straight path that extends without end in opposite direction
congruent
line segments have the same length, or angles that have the same measure
acute angles
An angle with a measure of less than 90 degrees
vertical angles
Form when two lines intersect
Opposite of each other and are congruent
perpendicular lines
Intersecting lines that cross each other at right angles
plane
An endless flat surface
open figures
Start and stop in different places
right angles
An angle with a measure of 90 degrees
adjacent angles
Angles that are side by side with a common vertex or ray
parallel lines
Two or more lines in the same plane that never intersect