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31 Cards in this Set
- Front
- Back
geometric model |
a geometric figure that represents a real life object |
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reflection symmetry / line symmetry |
when something can be divided along a line into 2 parts that are mirror images of each other |
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line of symmetry |
line that divides a plane figure into two parts that are mirror images of each other |
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point |
locations in space; has no size |
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line |
set of points that extends without end in two opposite directions |
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plane |
set of points that extends without end in all directions |
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figure |
any set of points |
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plane figure |
a set of points that all lie in the same plane |
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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 |
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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 |
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order of rotation symmetry |
number of times a figure coincides with its original position during a complete turn |
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n-fold rotational symmetry |
n = # of times a figure coincides with its original position during a complete turn |
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space |
set of all points |
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solid figure or solid |
3D figure that has all surface points and all points the surface encloses |
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intersection |
all of the points that 2 or more geometic figures have in common |
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cross section |
intersection of a 3D figure and a plane |
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net |
a 2D figure that when folded, forms the surface of a 3D figure |
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angle |
figure formed by 2 rays that have a common endpoint |
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ray |
part of a line that begins with one point and extends without end in one direction; the point is called the endpoint |
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endpoint |
point at the end of a ray or line segment |
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line segment |
part of a line with two endpoints |
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side [of an angle] |
ray(s) that form the angle |
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vertex |
endpoint of an angle |
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degree |
a common unit for measuring angles |
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similar figures |
figures that have the same shape, but not necissarily the same size; equal angles and proportional sides |
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congruent figures |
exactly the same size and shape |
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scale drawing |
2D drawing that is similar to the object it represents |
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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) |
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scale model |
3D figures whose surfaces are similar to the corresponding surfaces of the object it represents |
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collinear |
points on the same line |
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coplanar |
points and/or lines on the same plane |