Basic Concepts of Geometry

Front

What is the coordinate of a point on a line?

Back

A real number that corresponds to the point.

Front

What does every real number on a line correspond to?

Back

Exactly one point on the line.

Front

What is the distance between two points?

Back

The absolute value of the difference between their coordinates.

Front

What is the condition for three points F, G, and H to be collinear, with G between F and H?

Back

FG + GH = FH.

Front

What is the name of the point that divides a segment into two equal parts?

Back

The midpoint.

Front

How do you represent the length of segment AB?

Back

By writing AB without the segment symbol.

Front

What is the segment addition postulate?

Back

If B is between A and C, then AB + BC = AC.

Front

How do you name a segment with endpoints X and Y?

Back

By writing XY with a segment symbol above the letters.

Front

A ray

Back

Part of a line consisting of a given point, called the endpoint, and the set of all points on one side of the endpoint.

Front

An angle

Back

The union of two rays

having the same endpoint. The endpoint is called the vertex of the

angle; the rays are called the sides

of the angle.