Geometry Vocabulary

Front

What is a right angle?

Back

An angle that measures exactly 90 degrees.

Front

What is a midpoint?

Back

The point that divides a line segment into two equal parts.

Front

What is an acute angle?

Back

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

Front

What is a ray?

Back

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

Front

What is a line segment?

Back

A line segment is a part of a line that is bounded by two distinct endpoints.

Front

What is an obtuse angle?

Back

An obtuse angle is an angle that measures more than 90 degrees but less than 180 degrees.

Front

What is a straight angle?

Back

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

Front

What is a polygon?

Back

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

Front

What is a triangle?

Back

A triangle is a polygon with three edges and three vertices.

Front

What is a quadrilateral?

Back

A quadrilateral is a polygon with four edges and four vertices.