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Geometry

TermDefinition
base of a solid figure a base of a solid figure is usually thought of as a face upon which it can sit; most solid figures have more than one base
plane a flat surface that extends infinitely in all directions
y-coordinate in an ordered pair, the value that is always written second
congruent having exactly the same size and shape
y-axis in a coordinate plane, the vertical axis
line of symmetry a line that divides a figure into two congruent halves that are mirror images of each other
obtuse angle an angle between 90° and 180°
partition splitting shapes or numbers into smaller shares
quadrilateral a four sided polygon
ray a part of a line that has one endpoint and goes on forever in one direction
angle measurement the measure of the size of an angle
x-axis in a coordinate plane, the horizontal axis
x-coordinate in an ordered pair, the value that is always written first
protractor a tool used to measure and draw angles
endpoint a point at either end of a line segment, or a point at one end of a ray
ordered pairs a pair of numbers that gives the coordinates of a point on a grid (horizontal coordinate, vertical coordinate)
right rectangular prism a prism with six rectangular faces where the lateral edge is perpendicular to the plane of the base
origin the intersection of the x- and y-axes in a coordinate plane, described by the ordered pair (0,0)
coordinate system 2-dimensional system in which the coordinates of a point are its distances from two intersecting , usually perpendicular, straight lines called axes
classify to sort into categories or arrange into groups by attributes
coordinates an ordered pair of numbers that identify a point on a coordinate plane
side of a polygon any of the line segments that form a polygon
line a set of connected points continuing without an end in both directions
intersecting lines lines that cross at a point
attribute a characteristics of an object, such at color, shape, size, etc.
circular arc part of a circle between any two of its points
coordinate plane a 2-dimensional system in which the coordinates of a point are its distances from two intersecting usually perpendicular, straight lines called axes (also called a grid)
angle two lines that meet at a common point
acute angle an angle less than 90° but more than 0°
perpendicular lines two intersecting lines that form right angles
right angle a 90° angle, such as the corner of a square
arc part of a circle between any two of its points
solid figure a geometric figure with three dimensions
tiling a pattern of shapes repeated to fill a plane, the shapes do not overlap and there are no gaps
circle a figure with no sides an no vertices
right triangle a triangle that has one 90° angle
quadrants the four sections of a coordinate grid that are separated by the axes
vertex a point at which two or more sides of a geometric figure meet
parallel lines lines that are always the same distance apart
degree a unit for measuring angles, based on dividing a circle by 360
Created by: mslind