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The Language of Common Core Geometry
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Understanding the language or vocabulary of Geometry allows one to understand the process and function of Geometry problems.
Terms in this set (46)
Intersect-
-when two geometric figures have points in common
collinear
Points that lie on the same line
coplanar
lying in the same plane
rectangle
A parallelogram with four right angle ...four right angles ( in German rectangle means right angle)." A rectangle that is a 4 sided figure in which opposite sides are congruent and all angles are 90*."
Quadrilateral
a geometric figure that is made up of four line segments, called sides, that intersect only at their endpoints. This is a 4 sided polygon.
Equilateral
A triangle with three congruent sides
A 3 sided polygon that are congruent and have 360 * angles
mid-point
point that divides a segment into two congruent segments
equidistant from the end points
vertex
Each angular point of a polygon, polyhedron, or other figure.
Common end point of an angle. A vertex is always in the middle.
Line segment
part of a line with two endpoints
segment
A part of a line between two endpoints.
A segment is named by its end-points.
A piece of a line
line
A straight path that goes without end in two directions.
plane
A flat surface that extends infinitely in all directions.
point
single location in a plane
Example: where two lines intersect
ray
A part of a line that starts at one endpoint and extends forever. The first letter in a ray must be the endpoint.
When you put opposite rays together they form a line.
bisect
To divide into two equal parts
3 types of lines
horizontal- (--) , vertical ( I ) , diagonal ( oblique) ( / )
5 types of angles
acute, right, obtuse, straight, reflex
Acute angle
An angle less than 90 degrees but more than 0 degrees
Right angle
An angle that is 90 degrees (It makes a square in the corner).
Obtuse angle
An angle that measures more than 90 degrees but less than 180 degrees
Straight angle
An angle that is always 180 degrees
reflex angle
An angle that measures more than 180 degrees and less than 360 degrees. (This is the rest of the circle)
360* - X = reflex angle
Adjacent angles
Angles that have a common side and a common vertex (corner point).
linear pairs
pair of adjacent angles whose non-common sides are opposite rays (form a straight line)
congruent
Having the same size and shape
Supplementary
2 angles that add up to 180 degrees
Complementary
Angles whose measures add up to 90 degrees
ACUTE angles are the only angles that are complementary
Vertical angles
Angles that are opposite of each other and are congruent.
Example: X
Polygon
Many sided plane figure
Example: triangle-" tri " means 3 sided angle
Polyhedron
(The plural is polyhedra) A three dimensional object whose surfaces are composed of polygonal regions; a many sided , 3 dimensional,3 sided, solid.
Mono-
one side
poly-
many sided
Concave
CURVING INWARD
Convex
CURVED OUTWARD
consecutive sides
one after another
consecutive angles
Two angles that are adjacent and one after the other.
diagonal
a straight line through a figure from one corner to another corner
Concave quadrilateral
a quadrilateral that has a dent in it
Rhombus
A parallelogram with four equal sides
A diamond shape
equiangular
equal angles
Pentagon
5 sided polygon
Hexagon
6 sided polygon
Heptagon
7 sided polygon
Octagon
8 sided polygon
Decagon
10 sided polygon
Dodecagon
12 sided polygon
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