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Geometry
Lines and Angles
| Term | Definition |
|---|---|
| Line | a long, narrow mark or band |
| Line segment | a line that is bounded by two distinct end points |
| Ray | A line that starts at a point and goes off in a particular direction to infinity |
| Right Angle | an angle measuring 90 degrees |
| Acute Angle | an angle measuring less than 90 degrees |
| Obtuse Angle | an angle measuring greater than 90 degrees |
| Perpendicular Lines | Lines that intersect to make a right angle |
| Parallel Lines | Two lines that are always the same distance apart and never touch |
| Right Triangle | A triangle with exactly one right angle |
| Equilateral Triangle | A triangle with all 3 interior angles measuring 60 degrees |
| Line of Symmetry | a line across the figure such that the figure can be folded along the line into mirroring parts |
| Adjacent | having a common vertex or side |
| Congruent | equal |
| Protractor | an instrument for measuring angles |
| End point | a point or value that marks the end of a ray or one of the ends of a line segment or interval |
| Square | A plane figure with two sets of parallel sides, that are all congruent, and four right angles |
| Rectangle | A plane figure with two sets of parallel sides whose adjacent sides are not congruent and all right angles. |
| Kite | A plane figure whose two sets of congruent sides are adjacent to each other |
| Triangle | a plane figure with three straight sides and three angles |
| Rhombus | a plane figure with four congruent sides, one set of congruent obtuse angles, and one set of congruent acute angles. |
Created by:
hollydolly21
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