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Geo Vocab 9-2022
Basics of Geometry
| Term | Definition |
|---|---|
| A single location in space with no length, width, or height (zero dimensional). | Point |
| A collection of connected points that has no thickness and extends forever in two opposite directions. | Line |
| A collection of points along a line that has a starting point and extends forever in only one direction. | Ray |
| A collection of points along a line that has a starting point and an ending point. | Line Segment |
| A geometric object formed by two rays with a shared starting point. | Angle |
| A point where two lines or rays meet. | Vertex |
| An angle that measures exactly 90 degrees. | Right Angle |
| An angle that measures between 0 and 90 degrees. | Acute Angle |
| Measures between 90 and 180 degrees. | Obtuse Angle |
| Measures exactly 180 degrees. | Straight Angle |
| Angle measures add to 360 degrees. | Angles around a point. |
| Share a common ray. (“Side by side” or “next to”). | Adjacent Angles |
| Two angles whose measures add to 90 degrees. | Complementary Angles |
| Two angles whose measures add to 180 degrees. | Supplementary Angles |
| Opposite angles formed by intersecting lines. These angles have equal measurements. | Vertical Angles |
| Bisects a segment into two congruent segments. | Midpoint |
| A line, ray, or segment that passes through the midpoint of a segment forming right angles. | Perpendicular Bisector |
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