Geometry Vocab Flashcards
Acute angle
an angle that measures less than 90°
Obtuse angle
an angle that measure greater than 90°, but less than 180°
Complementary angle
two angles whose measure have a sum of 90°
Right angle
an angle that measures 90°
Supplementary angle
two angles whose measures have a sum of 180°
Straight angle
an angle that measures 180°
Alternate interior angles
two angles inside the parallel lines that are on opposite sides of the transversal
Vertical angles
two nonadjacent angles formed when two lines intersect. The angles in a vertical angle pair are congruent.
Line
a straight path that continues infinitely in both directions
Line segment
a line with definite endpoints
Ray
a part of a line starting at a particular point and extending infinitely in one direction
Parallel lines
lines in the same plane that do not intersect
Perpendicular lines
lines that intersect to form a 90° angle
Transversal
is a line that intersects two or more other lines at different points
Corresponding angle
a pair of angles that have the same relative position at each intersection where the transversal crosses the other two
Adjacent angles
angles that have a common side but no interior points in common
Alternate exterior angles
two angles outside of the parallel lines that are on opposite sides of the transversal
Congruent angle
an angle that has the same measure as another angle
Intersecting lines
lines that cross at one point
Vertex
is the common endpoint of the rays forming the angle
