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Geometry Basics I
Basic Geometric Terms, Including Angles and Lines
Term | Definition |
---|---|
Point | A specific location or mark usually identified by a letter |
Line | An endless straight path with no endpoints |
Line Segment | Part of a line between two endpoints |
Ray | A part of a line that has one endpoint and goes on forever in one direction |
Plane | An endless flat surface that uses three nonlinear points for its name |
Vertex | The point where two rays meet, creating an angle |
Acute Angle | An angle that measures less than ninety degrees |
Right Angle | An angle that measures exactly ninety degrees |
Obtuse Angle | An angle that measures greater than 90 degrees but less than 180 degrees |
Protractor | The semicircular instrument used to measure and/or construct an angle |
Polygon | A two-dimensional shape that has three or more sides |
Intersecting lines | Any lines that meet at a point. They do not have to form a ninety-degree angle. |
Parallel lines | Two lines that are an equal distance apart which will never meet |
Perpendicular lines | Two lines that meet to form a right angle |
Compass | An instrument that can be used to construct a circle |