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32 Cards in this Set
- Front
- Back
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Point |
• a location in space
• has no size |
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Line
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• set of points that extends without ends in two opposite directions
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Plane
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• set of points that extends without ends in all directions
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Figure
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• any set of points
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Plane Figure
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• a set of points that all lie in the same place
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Line of Symmetry
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• a line that divides a plane figure into two parts that are mirror images of each other
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Reflection Symmetry/ Line Symmetry
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• when something can be divided along a line into two parts that are mirror images of each other
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Rotational Symmetry
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• if a plane figure can be turned around a point, so it coincides with it's 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 it's original position two or more times during a complete turn, the point is the center of symmetry
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Order of Rotation Symmetry
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• the number of times the figure coincides with it's original position during a complete turn
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N-Fold
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•number of times of rotation in order of rotation symmetry
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Geometric Model |
* a geometric figure that represents a real life object
*a good model shows all the important characteristics of the object it represents |
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Space |
- set of all points |
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Solid Figures or Solid |
- 3D figure that has all surface points the surface encloses |
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Intersection |
- all points that two or more geometric figures have in common |
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Cross Section |
- the 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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Plane of Symmetry |
- a plane that divides a 3D figure into two parts that are mirror images |
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Axis of Symmetry |
- if a 3D 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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Depth |
- the distance of the top or surface of something to its bottom |
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Angle
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• the figure formed by two rays that have a common endpoint
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Ray
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• part of a line that begins at one point and extends without ends in one direction
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Endpoint
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• a point at the end of a ray or line segment |
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Line Segment (or segment)
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• part of a line that has two endpoints
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Side
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• ray(s) of the angle
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VertexDegree
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• endpoint of an angle (< = angle)
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Degree |
• a common unit more measuring angles
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Congruent Figures |
- figures that have exactly the same shape and size |
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Similar Figures |
- figures that have the same shape, but not necessarily the same size
-equal angles with proportional sizes |
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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 to the actual size of the object
- size of the drawing to size of the object
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Scale Model |
- 3D figure whose surfaces are similar to the corresponding surfaces of the object it represents |
