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33 Cards in this Set
- Front
- Back
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line of symmetry |
a line that divides a plane figure into two parts that re mirror images of each other |
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point |
a location, no size |
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line |
a set of 2 points that extends without end in all directions on a flat surface |
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plane |
set of points that extends without end in all directions on a flat surface |
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figure |
any set of points |
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plane figure |
a set of points that all lie on same plane |
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reflection symmetry |
a figure that can be divided into 2 parts that are mirror images of each other |
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rotational symmetry |
a plane figure that can be turned around a point so it coincides with its original position two or more times during a complete turn |
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center of symmetry |
if a plane figure can be turned around a point so it coincides with original position 2 or more times during a complete turn, the point is center of symmetry |
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order of rotation symmetry |
the number of times a plane figure coincides with its original position during a complete turn around its center of symmetry |
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n-fold |
number of times a figure rotates |
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geometric model |
a geometric figure that represents a real life object |
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space |
set of all points |
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solid figures or solid |
a 3 dimensional figure that consists of all its surface points and all the points the surface encloses |
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intersection |
the set of all points that 2 or more geometric figures have in common |
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cross section |
intersection of a 3 dimensional figure and a plane |
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angle |
the figure formed by two rays at a common end point |
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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 that begins at one point and ends at another |
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ray |
part of a line that begins at one point and extends without end in one direction |
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side |
rays of angle |
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vertex |
common endpoint of sides or angle |
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degree |
common unit for measuring angles |
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similar figures |
figures that have the same shape but not necessarily the same size |
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scale drawing |
a 2 dimensional drawing that is similar to object it represents, ratio of the size of drawing to actual size is scale of drawing |
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scale |
size of drawing, size of object |
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scale model |
a 3 dimensional figure whose surfaces are similar to corresponding surfaces of object it represents. Ratio of the size of the model to the actual size of object is scale of model |
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2-d |
plane figure, only two dimensions |
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3-d |
a figure that extends beyond a single plane into space and has 3 dimensions |
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depth |
the figure measurement going downward, backward or inward |
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net |
a 2 dimensional figure that, when folded forms the surface of a 3 dimensional figure |
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axis of symmetry |
if a 3 dimensional figure can be turned around a line so it coincides with its original position two or more times during a complete turn, the line is an axis of symmetry |
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plane of symmetry |
a plane that divides a 3 dimensional into two parts that are the same |
