Basic Geometry Terms

Front

What is a line in geometry?

Back

A line is one-dimensional and extends without end in two directions.

Front

What is a vertex in geometry?

Back

A vertex is the point where two rays, segments, etc. come together.

Front

What is a line segment?

Back

A line segment is part of a line that consists of two points, called endpoints.

Front

What is an obtuse angle?

Back

An obtuse angle is an angle with a measure between 90° and 180°.

Front

What are supplementary angles?

Back

Supplementary angles are two angles whose measures have the sum of 180°.

Front

What is a ray in geometry?

Back

A ray is a part of a line that starts at a point and extends infinitely in one direction.

Front

What is a right angle?

Back

A right angle is an angle that measures exactly 90°.

Front

What is an acute angle?

Back

An acute angle is an angle that measures less than 90°.

Front

What is a straight angle?

Back

A straight angle is an angle that measures exactly 180°.

Front

What is a transversal in geometry?

Back

A transversal is a line that intersects two or more lines at different points.