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A position in space with no size, weight, or volume. A point is represented by a dot and symbolized by a capital letter.
A straight set of points continuing indefinately in 2 directions. A line has no width, size or length. A line is represented by a double arrow with points and symbolized by naming two points or a single lower case letter as follows.
A flat surface extending indefinately in any direction. Planes have no thickness, size or weight. Planes are represented by parallelogram, and symbolized by one or more capital letters.
A part of a line between and including 2 endpoints. A line segment is symbolized by naming its two endpoints and placing a bar on top. Segment names are reversible, so they can be moved two ways.
A part of a line beginning at a point called the endpoint and continuing forever in one direction. It is symbolized by two letters, the first which MUST be the endpoint and the other is any point on the ray. Rays can have many names. (first letter of ray= endpoint)
of a segment is any line, ray, segment, or plane that passes through the midpoint of the segment
are two angles in a plane that have a common vertex, common side, but no common interior points
Postulate 4: Angle Addition Postulate
If point B lies in teh interior of angle AOC, then angle AOB + angle BOC= angle AOC
A line contains at least two points.
A plane contains at least three noncollinear points.
Space contains at least four noncoplanar points
Through any three points there is at least one plane, and through any three non-collinear points there is exactly one plane
If two points are in a plane, then the line that contains those points is in that plane.
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