Geometric Terms and Notations

Front

What is a line?

Back

A straight one-dimensional figure that extends infinitely in both directions.

Front

What is a plane in geometry?

Back

A flat two-dimensional surface that extends infinitely in all directions.

Front

What is a ray?

Back

Part of a line that has one endpoint and extends infinitely in one direction.

Front

How is an angle represented?

Back

An angle is represented by the symbol ∠ followed by the letters of the points that form the angle.

Front

What are collinear points?

Back

Points that lie on the same straight line.

Front

What is a line segment?

Back

A part of a line that has two endpoints.

Front

What is a vertex in geometry?

Back

A point where two or more lines or edges meet.

Front

What is a triangle?

Back

A polygon with three edges and three vertices.

Front

What is a right angle?

Back

An angle that measures exactly 90 degrees.

Front

What is a polygon?

Back

A closed figure formed by a finite number of straight line segments.