Basic geometry vocabulary that you MUST know.
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| 839936590 | Point | A location in space that has no length, width, or depth. |  | 1 |
| 839936591 | Line | Made up of an infinite number of points. Has infinite length, but no thickness or width. |  | 2 |
| 839949734 | Plane | A flat surface that has infinite length and width, but no depth. |  | 3 |
| 839953059 | Line Segment | A part of a line between two points. |  | 4 |
| 839951951 | Collinear Points | Points on the same line or line segment. |  | 5 |
| 839957488 | Ray | Part of a line that starts at one point and goes infinitely in one direction. |  | 6 |
| 839958775 | Angle | Formed by two rays that meet at an endpoint or formed by two intersecting lines. Measured in degrees. |  | 7 |
| 839960105 | Vertex | The endpoint where two rays meet to form an angle. |  | 8 |
| 839963555 | Right Angle | An angle that measures 90 degrees. |  | 9 |
| 841058879 | Straight Angle | An angle that measures 180 degrees. |  | 10 |
| 839963556 | Acute Angle | An angle that measures between 0 and 90 degrees. |  | 11 |
| 839966079 | Obtuse Angle | An angle that measures between 90 and 180 degrees. |  | 12 |
| 839969620 | Congruent | Two or more figures that are the same size and shape. Sides are equal in length and angles are equal in measure. |  | 13 |
| 839969621 | Line Bisector | Cuts a line segment into two congruent segments. |  | 14 |
| 839969622 | Angle Bisector | Cuts an angle into two congruent angles. |  | 15 |
| 839970652 | Adjacent Angles | Angles that share only one side and a vertex, but have no common interior points. |  | 16 |
| 841060984 | Linear Pair | Two adjacent angles formed by the intersection of two lines. These angles are supplementary (add to 180 degrees). |  | 17 |
| 841065228 | Vertical Angles | Two non-adjacent angles formed by two intersecting lines - across from each other. (<1 and <3 or <2 and <4) |  | 18 |
| 841066922 | Complementary Angles | Two angles whose measures add to 90 degrees. |  | 19 |
| 841066923 | Supplementary Angles | Two angles whose measures add to 180 degrees. | | 20 |
| 841068690 | Parallel | Two lines in a plane that never meet |  | 21 |
| 841068691 | Perpendicular | Two lines in a plane that intersect at right angles |  | 22 |
| 841071421 | Polygon | A closed figure formed by three or more line segments that intersect only at their endpoints. |  | 23 |
| 841073710 | Regular Polygon | A polygon with equal angles and equal sides. |  | 24 |
| 841078180 | Perimeter | The sum of the lengths of the sides of a polygon. |  | 25 |
| 841078181 | Circumference | The distance around a circle. |  | 26 |
| 841078182 | Area | the number of square units needed to cover a flat surface |  | 27 |
| 841082126 | Prism |  | 28 | |
| 841082127 | Pyramid |  | 29 | |
| 841082128 | Cylinder |  | 30 | |
| 841082129 | Cone |  | 31 | |
| 841082130 | Sphere |  | 32 | |
| 841091264 | Surface Area | The total area of the surface of a three-dimensional object |  | 33 |
| 841091266 | Volume | The amount of space enclosed by a solid (three-dimensional) figure. |  | 34 |
