Geometric jargon 2
description
Transcript of Geometric jargon 2
Geometric Jargon
Slide
cube
octagon
Acute AngleAn angle with a measure less than 90
“What a-cute angle!”
AngleTwo rays that share an endpoint
AreaThe measure, in square units, of the
inside region of the 2-dimensional figure
Base of a Solid Figure
A special face of a solid figure
ChordA line segment that joins any two points on a circle
Chord AB
AB
Circle A closed curve with all its points in one
plane and the same distance from the center
Circle
Circumference
The perimeter of a circle
Cone A 3-dimensional figure with 1 curved
surface, 1 flat surface (usually circular), 1 curved edge, and 1 vertex
cone
CompassA tool used to draw circles
Congruent
Having exactly the same size and shape
Coordinate GridA two-dimensional system in which the coordinates of a point are its distances
from two intersecting perpendicular lines called axes
Coordina ex
y
Coordinates
An ordered pair of numbers that gives the location of a point on a coordinate grid
CubeA regular solid with 6 congruent square
faces
Square face
Sq
uare
face
Cylinder
A 3-dimensional figure with 2 parallel and congruent circles as bases, 1 curved
surface, 2 curved edges, and 0 vertices
edges
curved surface
base
Diagonal
A line segment that joins two vertices of a polygon but is not a side of the polygon
Diameter A chord that goes through the center of a
circle
Edge The line segment where two faces of a
solid figure meet
Edge
Equilateral TriangleA triangle with all sides the same length
Face A plane figure that serves as one side of a
solid figure
face
Height
The length of a perpendicular line segment from a vertex to the base
height
Hexagon
A polygon with 6 sides
Hexagon
Intersecting Lines
Lines that meet or cross at a common point
in ersec ing lines
Isosceles Triangle
A triangle that has two congruent sides
Congruent Sides
Kite
A quadrilateral with two pairs of adjacent congruent sides
Length
The distance along a line or figure from one point to another
LENGTH
Line
An infinite set of points forming a straight path that goes in two directions without
end
Line Segment
A part of a line defined by two endpoints
Line of Symmetry A line that divides a figure into
two congruent halves that are mirror images of each other
Net
A 2-dimensional shape that can be folded into a 3-dimensional figure is a net of
that figure
NEnet of a
cube
Obtuse Angle
An angle with a measure greater than 90º and less than 180º
Parallel Lines (l l)
Lines that never intersect (always the same distance apart)
Parallelogram A quadrilateral with two pairs of parallel
and congruent sides
Pentagon
A polygon with 5 sides
Perimeter
The distance around a figure
Perpendicular linesLines that intersect to form right angles
Plane A flat surface that extends infinitely in all
directions
Polygon
A closed plane figure formed from line segments that meet only at their
endpoints
Prism A 3-dimensional figure that has two congruent and parallel faces that are polygons. The rest of the faces are
parallelograms.
Pyramid
A polyhedron whose base is a polygon and whose other faces are triangles that
share a common vertex
Quadrilateral A polygon with 4 sides
Radius
The segment, or the length of the segment, from the center of the circle
to any point on the circle
Ray
A part of a line that has one endpoint and extends indefinitely in one direction
Rectangle A quadrilateral with two pairs of
congruent, parallel sides and four right angles
Rectangular Prism A prism with 6 rectangular faces
Reflection (flip)A transformation creating a mirror image
of a figure on the opposite side of a line
Rhombus A parallelogram with all 4 sides equal in
length
Right Angle
An angle that measures exactly 90º
Rotation (turn)
A transformation in which a figure is turned a given angle and direction
around a point
Scalene TriangleA triangle that has no congruent sides
Similar FiguresFigures that have the same shape, but not
necessarily the same size
Sphere A 3-dimensional figure made up of all points that are equally distant from a
point called the center
Square
A parallelogram with 4 congruent sides and 4 right angles
Square Pyramid
A pyramid with a square base
Straight Angle
An angle with a measure of 180º
Tessellation
A covering of a plane without overlaps or gaps using combinations of congruent
figures
Three-Dimensional
An object that has length, width, and height
Translation (slide)A transformation that slides a figure a
given distance in a given direction
Trapezoid A quadrilateral with exactly two parallel
lines
Triangle
A polygon with three angles and three sides (“tri” means 3)
Triangular Pyramid
A pyramid with a base that is a triangle
Two-Dimensional
A figure that has length and width, but not height
Vertex
The point at which two line segments, lines, or rays meet to form an angle. Also, a point on a polyhedron where
three or more faces intersect.
VolumeThe number of cubic units it takes to
fill a solid
Volume = 12 cubic units
Width
One dimension of a 2- or 3- dimensional figure
width