Essential Geometry Vocabulary
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27 terms
Terms | Definitions |
|---|---|
 point |  no length or width, just something that indicates an exact location |
| line | extends forever in both directions |
| line segment | A straight line which links two points without extending past them. |
| ray | A portion of a line which starts at a point and goes off in a particular direction to infinity. |
| Plane | A flat surface that is infinitely large and with zero thickness |
| Angle | A shape, formed by two lines or rays diverging from a common point (the vertex) |
| Vertex | The common endpoint of two or more rays or line segments |
| Collinear | A set of points that lie in a straight line |
| Coplanar | Lying in the same plane |
| Right Angle | an angle that measures 90 degrees |
| Acute Angle | an angle less than 90 degrees but more than 0 degrees |
| Obtuse Angle | an angle between 90 and 180 degrees |
| Straight Angle | an angle of 180 degrees |
| Corresponding Angles | angles in the same place on different lines |
| Alternate Interior Angles | angles between 2 lines and on opposite sides of a transversal |
| alternate exterior angles | Angles that lie outside a pair of lines and on opposite sides of a transversal. |
| same side interior angles | two interior angles on the same side of the transversal |
| angle bisector | a ray that divides an angle into two congruent angles |
| perpendicular bisector | A line that is perpendicular to a segment at its midpoint. |
| complementary angles | two angles whose sum is a right angle |
| supplementary angles | Two angles whose sum is 180 degrees |
| adjacent angles | are a pair of angles with a common vertex and a common side, but no common interior points |
| vertical angles | two angles whose sides form two pairs of opposite rays |
| intersecting lines | lines that cross at one point |
| parallel lines | coplanar lines that do not intersect |
| perpendicular lines | Two lines that intersect to form right angles |
| transversals | a line that intersects 2 or more other lines |
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