Must
Two lines intersect at a
point
Two planes intersect at a
Line
Line
A straight arrangement of points that extends FOREVER and has no thickness or width. (one dimensional)
Line segment
Part of a line consisting of two endpoints and all points between them.
Congruent
Geometric figures that have exactly the same shape and same size.
Collinear
Points that are on the same line
Coplanar
Points or lines that are on the same plane
Line Symbol
Example - Line m (lower case letter in italics)
Two capital letters with a LINE symbol above it. Must have arrows on BOTH ends.
Line Segment Symbol
Two capital letters with a LINE SEGMENT symbol above it. NO arrows on either ends.
Conguence Symbol
≅
Endpoint
A point at either end of a segment or starting point of a ray.
There are an infinite number of points on a line but the minimum number of points needed to make a line is ... ?
Two points
Plane
A flat surface made up of points that extends infinitely in all directions, but has no thickness (two dimensional)
Plane G (upper case italics) or Plane ABC (3 points not on the same line)
Intersection
The set of points that two or more geometric figures have in common.
Congruent Segments
Segments that have the same measure (lengths)
"Tie Marks" show congruence
Undefined Term
Exampels: point, line or plane
*There's no limit to how big or small these things can be.
Point
A location that has no size or shape - no dimensions
Example - Point F or just F (capital letters only)
Two points will make more than one line. True or False?
False - two points will only make one line
One point will make only one line. True or False?
False - one point will create an infinite number of lines
Sketch/Draw
Creating a geometric figure either without using tools or using measuring tools like a protractor or ruler.
For any two points on a line, there is another point in between them.
If and only if, those 3 points are collinear, then the two segments should add to equal the total segment.
Example - Segment PMQ --> PM + MQ = PQ
A plane consists of at least how many points and what do these points need to be?
A plane consists of at least 3 non collinear points.
Axiom or Postulate
A statement that is accepted as true without proof.
Distance between points
The length of the segment with those points as endpoints.
*How far it is from one point to another.
Construct
Creating a geometric figure accurately using only a compass and straight edge