Math Terms Chapter 11
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47 terms
Terms | Definitions |
|---|---|
 Point | a location in space that has no size or shape |
| Line | a set of points that go forever in 2 directions (no curves in lines) |
| Line Segment | a part or a piece of a line that has a beginning and an end |
| Ray | a part or a piece of a line that has one endpoint and goes forever in one direction |
| Plane | a flat surgace that goes forever in all direction |
| Angle | a figure formed when 2 rays have a common end point |
| Vertex | the common endpoint if the rays that form an angle |
| Degree | a unit of measure for angles 360 degrees in a circle |
| Protractor | a tool used to measure angles in degrees |
| Acute Angle | an angle that is more than 0 degrees and less than 90 degrees |
| Right Angle | an angle that measures exactly 90 degrees |
| Obtuse Angle | an angle that is more than 90 degrees and less than 180 degrees |
| Straight Angle | an angle that measures exactly 180 degrees |
| Parallel | lines on the same plane that never intersect |
| Perpendicular | lines intesect to form right angles |
| Skew | lines that are not in the same plane, not intersecting, not parallel, and not perpendicular |
| Vertical Angles | formed when 2 lines intersect. opposite each other and are congruent |
| Congruent | means the same size and shape |
| Supplimentary Angles | angles whose measures add up to 180 degrees |
| Complemetary Angles | angles whose measures add up to 90 degrees |
| Adjacent Angles | two angles that share a common ray. They are "right next to eachother" |
| Transversal | a line that intersects two parallel lines |
| Alternate Interior Angles | between the parallel lines and on opposite sides of the transersal, and not adjacent |
| Alternate Exterior Angles | outside the parallel lines; on opposite sides of the transversal; not adjacent; congruent |
| Corresponding Angles | located in the same position on each of the parallel lines; are congruent |
| Acute Triangle | a triangle with 3 acute angles |
| Right Triangle | a triangle with one right angle; the other 2 are always acute |
| Obtuse Triangle | a triangle with one obtuse angle; the other two angles are always acute |
| Scalene Triangle | a triangle with all of the sides a different length |
| Isosceles Triangle | a triangle with at least two congruent sides |
| Equilateral Triangle | a triangle with 3 congruent sides; is always acute and also equiangular |
| Polygon | a closed plane figure made of line segments that meet at their endpoints to form vertices |
| Quadrilateral | a 4 sided polygon |
| Trapezoid | one pair of parallel sides |
| Parallelogram | 2 pairs of parallel sides; opposite sides are congruent |
| Rhombus | 2 pairs of parallel sides and 4 congruent sides |
| Rectangle | quadrilateral with 2 pairs of parallel sides; opposite sides are congruent; 4 right angles |
| Square | 2 pairs of parallel sides; 4 right angles; 4 congruent sides |
| Diagonal | a line segment that connects 2 non-consecutive vertices of a polygon |
| Regular Polygon | any polygon with all sides congruent (equilateral) and all angles congruent (equiangular) |
| Translation | a transformation that moves a figure, horizontally, vertically, or diagonally; it is also called a slide |
| Reflection | a transformation that flips a figure across a line; a mirror image |
| Rotation | a transformation that turns a figure around a point; the point of rotation can be on the figure, outisde the figure or inside the figure |
| Line of Symmetry | a line drawn through a figure that creates two halves that are mirror images of each other(that are congruent to each other |
| Equilateral | sides are congruent |
| Equiangular | angles are congruent |
| Similar Figures | two figure that are the same shape that have congruent corresponding angles, but are differenet sizes |
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