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Mattyj1388
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Line Segments
Line Segments: is a straight line from point A to point B; denoted by AB(with a line above it).

Endpoints
Endpoints: Are the ponts in which the line hits and stops. (rather then a line that passes through the point).

Halfline
Half Line or Ray: Is where you will have one endpoint and the the line segment passes through the pther point. (Donatred with AB with > above the AB).

Angle
Angle: An angle is formed by two rays with a common endpoint.

Vertex
Vertex: A vertex is a common endpoint.

Initial Side
Initial Side: By keeping one ray of the angle fixed, it becomes the Initial Side.

Terminal Side
Terminal Side: is the second ray that we allow to rotate to from an angle.

Degrees
Degrees: One of the units of measure used for angles.

Acute Angle
Acute Angle: An angle measuing less than 90^{o}.

Right Angle
Right Angle: An angle that measures exactly 90^{o}.

Obtuse Angle
Obtuse Angle: An angle that measures between 90^{o} and 180^{o }(but NOT including).

Straight Angle
Straigh Angle: An angle that measures exactly 180^{o}.

Perpendicular Lines
Perpendicular Lines: Lines that intersect at right (90^{o}) angles.

Complementary
Complementary: are angles that when added will give a right (90^{o}) angle.

Supplementary
Supplementary: Angles that when added will give a straight angle (180^{o}).

Vertical Angles
Verticle Angles: Occure when two lines overlap resulting in 4 angles between the two lines, (as seen in the picture) the oppisite angles will always equal one another (<1+<2 = 180 ^{o}; <2+<4 = 180 ^{o}, therefore <1 must =<4 and by result <2 must =<3). These angles are what we call vertical Angles (the angles oppisit from one another).

Parallel Lines
Parallel Lines: Are lines that have the same slope but different intercepts, meaning that they will never touch.

Transversal
 Transversal: A line that crosses any parralel lines is said to be trasnversal.
 Note: These will also than give us vertical Angles for each parrallel line that it crosses.

Corresponding Angles
Corresponding Angles: Are angles that are the same value because they are the same position on one line while on a seperate but parallel line. ( Please see picture above).

Alternate Interior Angles
Alternate Interior Angles: Are angles in the oppisite position that has to be the same value do to Vertical angles and corresponding angles. (Please see picture above).

