Basic Geometry Terms
1740561309 | Point | A point has no size. | 0 | |
1740561310 | Line | Goes on forever in both directions. Two points create a line. | 1 | |
1741609981 | Plane | A flat surface that has no thickness. Three points create a plane. | 2 | |
1741609982 | Collinear | Points that lie on the same line. Points E, F, & C are collinear. | 3 | |
1741609984 | Non-collinear | Points that do not lie on the same line. Points E, F, & D are non-collinear. | 4 | |
1741609983 | Coplanar | Points and/or lines in the same plane. E, F, A, & B are coplanar points. | 5 | |
1741637033 | Intersection of Two Lines | If two lines intersect, it is at exactly one point. Point C is the intersection of the two lines. | 6 | |
1741637034 | Intersection of Two Planes | If two planes intersect, then they intersect in exactly one line. | 7 | |
1741637035 | Line Segment | The part of a line consisting of two endpoints and all the points between them. | 8 | |
1741637036 | Ray | The part of a line consisting of one endpoint and all the points of the line on side of the endpoint. | 9 | |
1741637037 | Opposite Rays | Two collinear rays with the same endpoint. Two opposite rays form a line. | 10 | |
1741644306 | Parallel Lines | Coplanar lines that do not intersect. | 11 | |
1741644307 | Skew Lines | Non-coplanar lines that do not intersect. Skew lines are NOT parallel. | 12 | |
1741724843 | Angle | Formed by two rays with the same endpoint. | 13 | |
1741724844 | Midpoint | The point that divides the segment into two congruent segments. | 14 | |
1741724856 | Congruent | Having equal measure. | 15 | |
1741724845 | Perpendicular Lines | Lines that intersect and form right angles. | 16 | |
1741724846 | Acute Angle | An angle whose measure is between 0 and 90 degrees. | 17 | |
1741724847 | Right Angle | An angle that measures 90 degrees. | 18 | |
1741724848 | Obtuse Angle | An angle whose measure is between 90 and 180 degrees. | 19 | |
1741724849 | Straight Angle | An angle that measures 180 degrees. | 20 | |
1741724850 | Complementary Angles | Two angles are complementary if the sum of their measures is 90 degrees. | 21 | |
1741724851 | Supplementary Angles | Two angles are supplementary is the sum of their measures is 180 degrees. | 22 | |
1741724852 | Adjacent Angles | Two coplanar angles that have a common side and a common vertex, but no common interior points. | 23 | |
1741724853 | Linear Pair | Two adjacent, supplementary angles. | 24 | |
1741724854 | Vertical Angles | Two angles whose sides form two pairs of opposite rays. | 25 | |
1741724855 | Angle Bisector | A ray that divides an angle into two congruent angles. | 26 |