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30 Cards in this Set
- Front
- Back
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point |
location, has no size |
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line |
set of points that extends without end in 2 opposite direction |
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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 |
set of points that all lie in the same place |
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reflection symmetry |
when something can be divided along a line into two parts that are mirror images |
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line of symmetry |
a line that divides a plane figure into 2 parts that are mirror images |
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rotational symmetry |
when a plane figure can be turned around a point so it coincides with its original position 2+ times in a complete turn |
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center of symmetry |
if a plane figure can be turned around a point so it coincides with its original position 2+ times in a complete turn, the point is the center of symmetry |
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order of rotation symmetry |
number of times the figure coincides with its original position in one turn |
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n-fold |
number of times the figure coincides with its original position in one turn n=the number of times ex. 3-fold for an equilateral triangle |
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geometric model |
A geometric figure that represents a real life object |
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space |
the set of all points |
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solid figure or solid |
A 3d figure that consists of all its surface points and all the points the surface encloses |
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plane symmetry or reflection symmetry of a 3d figure |
a 3d figure has reflection symmetry if it can be divided along a plane into two parts that are mirror images of each other |
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plane of symmetry |
a plane that divides a 3d figure into two parts that are mirror images of each other |
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intersection of geometric figures |
the set of points common to all the figures |
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cross section |
the intersection of a 3d figure and a plane |
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axis of symmetry |
if a 3d figure can be turned around a line so it coincides with its original position 2 or more times during a complete turn the line is an axis of symmetry |
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endpoint |
the point(s) on a ray, segment, and arc. |
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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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line segment or segment |
part of a line that begins at one point and ends at another |
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angle |
the figure formed by two rays that have a common endpoint |
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vertex of an angle |
the common endpoint of the sides |
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side of an angle |
one of the two rays that form the angle |
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scale drawing |
a 2d drawing that is similar to the object it represents. |
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scale |
the ratio of the size of the drawing/model to the actual size of to object |
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scale model |
a 3d figure whose surfaces are similar to the corresponding surfaces of the object it represents |
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degree |
common unit for measuring angles |
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similar figure |
equal angles and sides are proportional |
