Gordon Geometry
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33 terms
Terms | Definitions |
|---|---|
 polygon |  any closed flat figure with straight sides |
| triangle |  a polygon with 3 sides and 3 angles |
| square |  a quadrilateral that has four congruent sides and four right angles |
| rectangle |  a quadrilateral with four right angles who opposite sides are parallel |
| pentagon |  a polygon with five sides |
| hexagon |  a polygon with six sides |
| quadrilateral |  any polygon with four straight sides |
| line |  a straight line that goes on forever in both directions (shown with arrows) |
| line segment |  part of line with two endpoints (shown with dots) |
| ray |  part of a line with one endpoint and going on forever in one direction (shown with a dot on one end and an arrow on the other) |
| parallel lines |  lines on a flat surface that never meet; they are always the same distance apart |
| intersecting lines |  lines that meet or cross at a common point |
| right angle |  an angle that forms a square corner (90 degrees) |
| acute angle |  an angle that is less than a right angle (less than 90 degrees) |
| obtuse angle |  an angle that is greater than a right angle (more than 90 degrees) |
| congruent figures |  figures having the same size and shape |
| similar figures |  figures that have the same shape but aren't the same size |
| ordered pairs |  help you locate points on a graph; (5,1) tells you to move across 5 and up 1 |
| line of symmetry |  a line on which a figure can be folded so that the two halves match exactly |
| slide |  a move in a straight line without changing direction |
| flip | a move over an imaginary line that puts the object in the opposite direction or on the opposite side |
| turn | a move clockwise or counterclockwise around a point |
| face |  a flat side of a space figure |
| edge |  the line segment where two faces of a space figure meet |
| corner |  where 3 or more edges meet on a space figure; also called a vertex (plural = vertices) |
| perimeter |  the distance around a figure or an object |
| area |  the number of square units needed to cover a surface |
| volume |  the number of cubic units in a space figure |
| right triangle |  a triangle with one right angle |
| isosceles triangle |  a triangle with at least 2 equal sides |
| equilateral triangle | a triangle with all the sides being equal |
| scalene triangle | a triangle with no equal sides |
| solid figures |  shapes that take up space; they are three-dimesional NOT flat |
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