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Topic 11 Part 1
Two Dimensional Shapes and Their Attributes Lessons 1 and 2
Term | Definition |
---|---|
point | An exact position, often marked by a dot. |
line | A set of points that forms an endless straight path in opposite directions. |
line segment | A part of a line with two endpoints. |
intersecting lines | Lines that cross at one point. |
parallel lines | Lines that never cross. |
ray | A part of a line with only one endpoint |
angle | Two rays with the same endpoint; that endpoint is the vertex of the angle. |
vertex of an angle | The endpoint of two rays that form an angle. |
right angle | An angle that makes a square corner. |
perpendicular | Two lines, line segments, or rays that make a right angle. |
acute angle | An angle that is open less than a right angle. |
obtuse angle | An angle that is open more than a right angle. |