# Shared Flashcard Set

## Details

Rainer Geometry March 23
Angles, Lines, Rays, etc.
18
Mathematics
03/24/2009

Term
 1. Angle
Definition
 a figure formed by two rays that have a common endpoint.
Term
 2. Point
Definition
 an exact location in space, usually represented by a dot.
Term
 3. Line
Definition
 a straight path in a plane, extending in both directions with no endpoints.
Term
 4. Line Segement
Definition
 a part of a line between two endpoints
Term
 5. Ray
Definition
 a part of a line; it begins at one endpoint and extends forever in one direction.
Term
 6. Plane
Definition
 a flat surface that extends without end in all directions.
Term
 7. Right Angle
Definition
 a special angle formed by perpendicular lines and equal to 90 degrees.
Term
 8. Acute Angle
Definition
 an angle that measures less than 90 degrees.
Term
 9. Obtuse Angle
Definition
 an angle whose measure is greater that 90 degrees and less than 180 degrees.
Term
 10. Polygon
Definition
 a closed plane figure formed by three or more line segments.
Term
 11. Straight Angle
Definition
 an angle that measures 180 degrees.
Term
 12. Parallel Lines
Definition
 lines in a plane that are always the same distance apart.
Term
 13. Intersecting Lines
Definition
 Lines in a plane that cross at exactly one point.
Term
 14. Perpendicular Lines
Definition
 two lines in a plane that intersect to form right angles.
Term
 Transformations
Definition
 Geometric figures can be transformed by translating, rotating, or reflecting them. These big words just meant that you can slide, turn, and flip figures. The new figures are congruent to the orginal figures.
Term
 Translation
Definition
 When you translate a figure, you slide it in one direction without turning it or flipping it (slide).
Term
 Rotation
Definition
 When you rotate a figure, you turn it around a point. You can rotate a figure clockwise or counterclockwise. (Turn)
Term
 Reflection
Definition
 When you reflect a figure, you flip it over a line. Think of reflection as the mirror-image of a figure. You can reflect a figure over a horizontal or vertical line. (Flip)
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