| A | B |
|---|
| Point | Exact Location |
| Line | Straight Path that extends without end in opposite directions |
| Plane | flat surface that extends without end in all directions |
| Line Segment | 2 endpoints and all the points between the endpoints |
| Ray | One endpoint with a ray extending without end in one direction |
| Acute Angle | Angle measuring less than 90 degrees |
| Right Angle | Angle measuring exactly 90 degrees |
| Obtuse Angle | Angle measuring more than 90 degrees but less than 180 degrees |
| Straight Angle | Angle measuring exactly 180 degrees |
| Congruent | Same size and shape |
| Vertical Angles | formed opposite of each other when 2 lines intersect...have the same measure |
| Adjacent Angles | Side by side angles that have a common vertex and ray...add up to 180 degrees |
| Complementary Angles | 2 angles with a sum of 90 degrees |
| Supplementary Angles | 2 angles with a sum of 180 degrees |
| Parallel Lines | lines in the same plane that never intersect |
| Perpendicular Lines | Lines that intersect to form 90 degree angles, or right angles |
| Skew Lines | Lines that lie in different planes and will never intersect |
| Acute Triangle | Has 3 acute angles |
| Obtuse Triangle | Has 1 obtuse angle |
| Right Triangle | Has 1 right angle |
| Scalene Triangle | Has no congruent sides |
| Isosceles Triangle | Has 2 congruent sides |
| Equilateral Triangle | Has 3 congruent sides |
| Triangle | Polygon with 3 sides |
| Quadrilateral | Polygon with 4 sides |
| Pentagon | Polygon with 5 sides |
| Hexagon | Polygon with 6 sides |
| Octagon | Polygon with 8 sides |
| Heptagon | Polygon with 7 sides |
| Nonagon | Polygon with 9 sides |
| Decagon | Polygon with 10 sides |
| Dodecagon | Polygon with 12 sides |
| Parallelogram | Quadrilateral with opposite sides parallel and congruent; opposite angles are congruent |
| Rectangle | Quadrilateral with 4 right angles; opposite sides are parallel and congruent |
| Rhombus | Quadrilateral with 4 congruent sides; opposite angles are congruent |
| Square | Quadrilateral with 4 congruent sides; all angles are right angles |
| Trapezoid | Quadrilateral with exactly 2 parallel sides; may have 2 right angles |
| Polygon | closed figure formed by 3 or more straight line segments |
| Regular Polygon | Polygon in which all sides and angles are congruent |
| Transformation | Movement of a figure without changing its size or shape |
| Translation | Movement of a figure along a straight line (slide) |
| Rotation | Movement of a figure around a point (turn) |
| Reflection | Movement of a figure by flipping it over a line to create a mirror image (flip) |
