These are vocabulary notecards for basic geometry terms in McDougal Littel Geometry book Chapter 1.
Terms : Hide Images
| 1640303777 | point | A location. It is a point with no length, width, and thickness. | 0 | |
| 1640303778 | line | infinite set of points that extends in two directions. It has length but no width or thickness. | 1 | |
| 1640303779 | plane | infinite set of points that creates a flat surface that extends without ending. A plane has length and width but no thickness. | 2 | |
| 1640303780 | space | the set of all points | 3 | |
| 1640303781 | collinear | points on the same line | 4 | |
| 1640303782 | non collinear | points not on the same line | 5 | |
| 1640303783 | coplanar | points in the same plane | 6 | |
| 1640303784 | non coplanar | points not in the same plane | 7 | |
| 1640303785 | "XZ" | A representation of a number, showing length between two points. | 8 | |
| 1640303786 | XZ (with line over) | A line segment between imaginary points X and Z. | 9 | |
| 1640303787 | segment | Two points on the line and all points between them. The two points are called the endpoints of the segment. | 10 | |
| 1640303788 | ray | Part of a line that consists of an endpoint and all points on the line that extend in one direction | 11 | |
| 1640303789 | opposite rays | Given three collinear points R, S, T: If S is between R and T, then ray SR and ray ST __________. | 12 | |
| 1640303790 | intersection of two figures | set of points that are in both figures | 13 | |
| 1640303791 | coordinate of a point on a number line | On a number line every point is paired with a number and every number is paired with a point. | 14 | |
| 1640303792 | distance | Absolute value of the difference in their coordinates. | 15 | |
| 1640303793 | length | A positive distance between two points. | 16 | |
| 1640303794 | congruent | Two objects that have the same size and shape. | 17 | |
| 1640303795 | congruent segments | Segments that have equal lengths. | 18 | |
| 1640303796 | midpoint of a segment | The point that divides the segment into two congruent segments. | 19 | |
| 1640303797 | bisector of a segment | A line, segment, ray, or plane that intersects the segment at its mid point. | 20 | |
| 1640303798 | equidistant | an equal distance from | 21 | |
| 1640303799 | oblique plane | A plane that is not horizontal and not vertical | 22 | |
| 1640303800 | between | All points between a designated start and end point on the same line. | 23 | |
| 1640303801 | postulate | A statement that is accepted without proof. | 24 | |
| 1640303803 | angle | A figure formed by two rays that have the same endpoint. The two rays are called the sides of the angle. Their common endpoint is the vertex. | 25 | |
| 1640303804 | sides | two rays of angle | 26 | |
| 1640303805 | vertex | common endpoint of sides of angle | 27 | |
| 1640303811 | Congruent angles | Angles that have equal measures. | 28 | |
| 1640303802 | Bisector of an angle | The ray that divides the angle into two congruent adjacent angles. | 29 | |
| 1640303807 | Adjacent angles | Two angles in a plane that have a common vertex and a common side but no common interior points. | 30 | |
| 1640515316 | complementary angles | Two angles whose sum is 90 degrees | 31 | |
| 1640515317 | supplementary angles | Angles that add to 180 degrees. | 32 | |
| 1640303806 | Acute angle | A triangle with three acute angles | 33 | |
| 1640303808 | Right angle | An angle with measure 90. | 34 | |
| 1640303809 | Obtuse angle | A triangle with one obtuse angle | 35 | |
| 1640303810 | Straight angle | An angle with measure 180 | 36 | |
| 1640303812 | theorems | Statements that can be proved. | 37 | |
| 1640303813 | exists | there is at least one | 38 | |
| 1640303814 | unique | there is no more than one | 39 | |
| 1640303815 | one and only one | exactly one | 40 | |
| 1640303816 | determine | to define or specify | 41 | |
| 1640303817 | "undefined" terms | intuitive ideas and are not defined | 42 | |
| 1640303818 | "two points" | different points | 43 | |
| 1640303819 | "three lines" | different lines | 44 | |
| 1640303820 | horizontal plane | a plane represented by a figure with two sides horizontal and no sides vertical | 45 | |
| 1640303821 | vertical plane | a plane represented by a figure in which two sides are vertical | 46 | |
| 1640303822 | linear pair | 2 angles form a linear pair if and only if: 1) they are adjacent angles and 2) their non-common sides are opposite rays. Note that the sum of the measures of two angles in a linear pair is 180. | 47 | |
| 1640303823 | exists | There is at least one corresponding to condition specified. | 48 | |
| 1640303824 | exactly one | one and only one | 49 | |
| 1640515318 | polygon | A closed geometric figure in a plane formed by connecting line segments endpoint to endpoint with each segment intersecting exactly two others. Polygons are classified by the number of sides they have, such as a triangle has three sides, a quadrilateral has four sides, and a pentagon has five sides. | 50 | |
| 1640515319 | convex polygon | A polygon is convex if no line that contains a side of the polygon contains a point in the interior of the polygon. | 51 | |
| 1640515320 | concave polygon | A polygon where at least one line segment joining any two interior points lines partially outside the polygon (does not pass the rubber band test) | 52 | |
| 1640515321 | n-gon | A polygon with n sides. | 53 | |
| 1640515322 | equilateral polygon | a polygon in which all sides are congruent | 54 | |
| 1640515323 | equiangular polygon | a polygon whose angles are all congruent | 55 | |
| 1640515324 | regular polygon | a convex polygon that is both equilateral and equiangular. | 56 | |
| 1640515325 | lines of symmetry | a line that divides a figure into two parts that are mirror images of each other | 57 | |
| 1640515326 | diagonals | A line segment that connects two non-consecutive vertices of a polygon; there are n(n-3)/2 diagonals in an n-gon | 58 | |
| 1640515327 | Perimeter of a square | P=4s | 59 | |
| 1640515328 | Area of a square | A = s² | 60 | |
| 1640515329 | Perimeter of a rectangle | P=2l+2w | 61 | |
| 1640515330 | Area of a rectangle | A = lw | 62 | |
| 1640515331 | Perimeter of a triangle | P = a + b + c | 63 | |
| 1640515332 | Area of a triangle | A=1/2bh | 64 | |
| 1640515333 | Circumference of a circle | C = 2πr | 65 | |
| 1640515334 | Area of a circle | A = πr² | 66 |
