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30 Cards in this Set
- Front
- Back
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geometric model |
a geometric figure that represents a real life object |
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line of symmetry |
a line that divides a plane figure into two parts that are mirror images of each other |
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reflection symmetry |
it can be divided along a line into two parts that are mirror images of each other: also called line symmetry |
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point |
a location in space that has no size |
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line |
a set of points that extends without end in two opposite directions |
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plane |
a set of points that extends without end in all directions along 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 in the same plane |
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center of symmetry |
if plane figure can be turned around a point so it coincides with the original position two or more times during a complete rotation, the point is the center of symmetry |
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rotational symmetry |
when a plane figure is turned around and coincides with its original position two or more times you have rotational symmetry |
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order of rotation symmetry |
the number of times the figure coincides with its original position during the complete turn |
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n-fold rotational symmetry |
how many times it matches up...see order of rotation symmetry |
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Space
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Set of all points
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Vertex
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End points if an angle
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Degree
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A common unit for measuring angles
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Acute angle
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Less than 90
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Obtuse angle
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More than 90
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Similar figures
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Equal angles, sides are proportional but can be different size
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Scale drawing
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2D drawing that is similar to what is represents
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Scale
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Size of drawing: (to) size of object
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Scale model
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A 3D figure whose surfaces are similar to the corresponding surfaces of the actual object
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Solid figures/solid
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3D figure that had all surface points and all the points the surface encloses
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Intersection
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All the points that 2 or more geometric figures have in common
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Cross section
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The intersection of a 3D figure and a plane
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Net
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A 2D figure that when folded forms forms the surface of a 3D figure
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Ray
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Part of a Lon that begins with an endpoint and extends infinitely
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Angle
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Figure formed by two rays with a common endpoint
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Endpoint
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Point at the end of a ray or line segment
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Line segment
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A part of a line with two midpoints
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Side
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Ray (s) of the angle
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