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# geometry

acute angle an angle with a measure greater than 0 degrees and less than 90 degrees
adjacent angles angles that share an common ray and have the same origin
angle a geometric figure formed by two rays joined at their origins
bisect to divide into two equal parts
bisector a line or line segment that divides another figure into two equal parts
collinear lying on the same line
complementary angles two angles with measures that add up to 90 degrees
congruent having exactly the same size and shape
coplanar lying in the same plane
degree a unit of measure for angles; 1/360th of a circle
empty set a set having no elements; also called a null set
infinite without end; unable to be counted or measured
interior angle angle within a polygon; angle within two parallel lines that are crossed by a transversal
line in geometry, a set of connected points that extends infinitely in two directions
line segment a section of a line bounded by two endpoints
midpoint the point exactly in the center of a line segment
null set a set having no elements; also called empty set
obtuse angle an angle with a measure greater than 90 degrees and less than 180 degrees
origin the endpoint of a ray; on a coordinate grid, the point at the intersection of the axes, generally identified by the ordered pair ( 0, 0 )
parallel lines lines in the same plane that do not intersect
perpendicular lines lines that form right angles when they intersect
perpendicular bisector a line or line segment that is perpendicular to another line segment through its midpoint
pi the Greek letter, which represents an irrational number with an approximate value of 22/7 or 3.14
plane a flat, two dimensional surface that extends infinitely in all directions
plane geometry the study of figures that all lie in one plane
point a defined position in space that has no dimension; represented with a dot
protractor a device used to measure the number of degrees in an angle
ray a geometric figure that starts at a definite point (called the origin) and extends infinitely in one direction
reflex angle an angle that has a measure between 180 degrees and 360 degrees
right angle an angle measuring 90 degrees
set a collection of items
straight angle an angle with an measure of 180 degrees
subset a part of a given set
supplementary angles two angles with measures that add up to 180 degrees
union the combined elements from two or more sets
vertex the endpoint shared by two rays, line segments, or edges; plural is verticles
vertical angles the angles opposite each other when two lines intersect
circle a set of points an equal distance from the center
radius the distance from the center to the edge
chord intercepts the circle
circumstance the perimeter of circle
oval/ellipse a stretched circle
diameter measures through
secant where a line goes through at a couple points
sector a piece of the area of the circle
edge the lines where the faces of a rectangular solid meet
cubed units the volume of a geometric solid
vertices the edges of a rectangular solid meet in points called
circle the base of a cylinder is a
face the flat surface of an rectangular solid
cylinder geometric solid with a circular base and sides perpendicular to the base
Created by: 088103