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31 Cards in this Set

  • Front
  • Back

geometric model

a geometric figure that represents a real life object

reflection symmetry / line symmetry

when something can be divided along a line into 2 parts that are mirror images of each other

line of symmetry

line that divides a plane figure into two parts that are mirror images of each other

point

locations in space; has no size

line

set of points that extends without end in two opposite directions

plane

set of points that extends without end in all directions

figure

any set of points

plane figure

a set of points that all lie in the same plane

center of symmetry

the point where a plane figure can be turned around so it coincides with its original position 2 or more times during a complete turn

rotational symmetry

if a plane figure can turn around a point so it coincides with the original position 2 or more times it has rotational symmetry

order of rotation symmetry

number of times a figure coincides with its original position during a complete turn

n-fold rotational symmetry

n = # of times a figure coincides with its original position during a complete turn

space

set of all points

solid figure or solid

3D figure that has all surface points and all points the surface encloses

intersection

all of the points that 2 or more geometic figures have in common

cross section

intersection of a 3D figure and a plane

net

a 2D figure that when folded, forms the surface of a 3D figure

angle

figure formed by 2 rays that have a common endpoint

ray

part of a line that begins with one point and extends without end in one direction; the point is called the endpoint

endpoint

point at the end of a ray or line segment

line segment

part of a line with two endpoints

side [of an angle]

ray(s) that form the angle

vertex

endpoint of an angle

degree

a common unit for measuring angles

similar figures

figures that have the same shape, but not necissarily the same size; equal angles and proportional sides

congruent figures

exactly the same size and shape

scale drawing

2D drawing that is similar to the object it represents

scale

ratio of drawing/model to the actual size of the object is the scale of the drawing/model


(size of drawing : size of object)

scale model

3D figures whose surfaces are similar to the corresponding surfaces of the object it represents

collinear

points on the same line

coplanar

points and/or lines on the same plane