The intersection of to lines is a …
point 
angle
A figure formed by two rays with a common endpoint.[image]
collinear
Points lying on the same line.[image]
coplanar
Points lying on the same plane.[image]
intersect
Two or more points in common.

[image]

line
An undefined term in geometry, understood to be perfectly straight, has no thickness, contain and infinite amount of points, and extend infinitely in both directions.[image]s.
plane
An undefined term in geometry, which is understood to be a flat surface that extends infinitely in all directions. 
point
An undefined term in geometry, that can be thought of as a dot that represents a location in space that has no size.[image]
postulate
A statement that is accepted as true without proof.
ray
A part of a line that starts at a point and extends infinitely in one direction. 
segment
A part of a line that begins at one point and ends that another.

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vertex of an angle
The point in common of the two rays that form an angle.[image]
The intersection of two planes is a ..

.

line. 
Through any two points there is one and only …
line 
Through any three noncollinear points there is one and only one…

plane. 
If there are two points in a plane, then the line containing them is in the …
plane. 
congruent
The relationship between figures having the same size and shape. 
length
The distance from one endpoint to another.abs val ( a – b )  orabs val ( b – a )
Segment Congruence Postulate
If two segments have the same length as measured by a fair ruler, then the segments are congruent.

Also, if two segments are congruent, then they have the same length as measured by a fair ruler.

Segment Addition Postulate (line including points PQR)
If point Q is between points P and R on a line, then PQ + QR = PR 
acute angle
An angle whose measure is less than 90 degrees. 
complementary angles
Two angles whose measure has a sum of 90 degrees.

 

linear pair of angles
These angles are created when two lines intersect.  The measure of the line is 180 degrees, so the angles must also sum 180 degrees. 
obtuse angle
An angle whose measure is greater than 90 degrees. 
right angle
An angle whose measure is 90 degrees. 
supplementary angles
Two angles whose sum has a measure of 180 degrees.

 

Angle Addition Postulate
Angle Addition Postulate states that if a point S lies in the interior of ?PQR, then ?PQS + ?SQR = ?PQR. 
Angle Congruence Postulate
If angles have the same measure, then they are congruent.  If two angles are congruent, then they have the same measure. 
Linear Pair Property
If two angles form a linear pair, then they are supplementary. 
angle bisector
A ray that divides an angle into two congruent angles. 
center of rotation
The point at which an image rotates around. 
circumcenter
The center of a circumscribed circle; the point which the three perpendicular bisectors of the sides of a triangle intersect. 
circumscribed circle
A circule that is drawn around the outside a triagle and contains all three vertices. 
concurrent
Literally, “running together”; of three or more lines, intersecting at a single point. 
conjecture
A statement that is believed to be true.
endpoint
A point at an end of a segment or the starting point of a ray. 
incenter
The center of an inscribed circle; the point where the three angle bisectors of a triangle intersect. 
inscribed circle
Is a circle inside a triangle that touches each side of the triangle at one point. 
midpoint of a segment
The point that divides a segment into two congruent segments. 
parallel lines
Coplanar lines that never intersect. 
perpendicular bisector
A line that is perpendicular to a segment at its midpoint. 
perpendicular lines
Lines that intersect to form right angles. 
preimage
A shape that undergoes a motion or a transformation.
reflection
A transformation that creates a mirror image.
rotation
A transformation where the image is rotated around a single point. 
translation
A transformation in which every point on the image moves/slides the same direction. 
rigid transformation
A transformation that does not change the shape or size of a figure.