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A point specifies only location; it has no length, width, or depth. We usually represent a point with a dot on paper, but the dot we make has some dimension, while a true point has dimension 0. |
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| A line has only one dimension: length. It continues forever in two directions (so it has infinite length), but it has no width at all. A line connects two points via the shortest path, and then continues on in both directions |
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| A line segment is the portion of a line lying strictly between two points. It has a finite length and no width. |
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| A ray can be thought of as a half a line. It has a point on one end, and it extends infinitely in the other direction. |
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| A plane is a flat, two-dimensional object. We often represent a plane by a piece of paper, a blackboard, or the top of a desk. In fact, none of these is actually a plane, because a plane must continue infinitely in all directions and have no thickness at all. A plane can be defined by two intersecting lines or by three non-collinear points. |
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| two rays with a common endpoint that form a line |
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| the union of 2 rays that have the same endpoint; measured in degrees or radians (trig.); the five types of angles are zero, acute, right, obtuse, and straight |
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the point M of [image] where AM = AB
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| a ray that is in the interior of an angle and forms two equal angles with the sides of that angle |
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| two figures where one is the image of the other under a reflection or composite of reflections |
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| a description of a point in a network where it is possible for two different segments to share the same endpoints |
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| an angle whose measure is greater than 0 but less than 90 degrees |
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| an angle whose measure is greater than 90 but less than 180 degrees |
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| an angle whose measure is 90 degrees |
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| an angle whose measure is 180 degrees, forming a line with its sides |
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Complementary angles
[image] |
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| 2 angles whose measures, when added together, equal 90 degrees |
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Supplementary angles
[image] |
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| angles that add up to 180 degrees |
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| 2 angles that share a common vertex and whose sides form 2 lines |
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| 2 nonstraight and nonzero angles that have a common side in the interior of the angle formed by the noncommon sides |
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| 2 supplementary adjacent angles whose noncommon sides form a line |
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Perpendicular lines
[image] |
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| 2 segments, rays, or lines that form a 90 degree angle |
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| a union of 3 or more segments where each segment intersects 2 other segments, one at each endpoint; "many sided" |
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| A shape or solid that has an indentation if there is atleast one line segment connecting interior points which passes outside the figure |
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| a geometric fugure with no identions. also if every line segmentconnecting interior points is entirely contained with the figures interior |
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| A line segment connecting connecting non-adjacent vertices of a polygon |
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| the distance around the outside of a plane figure |
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