Geometry Vocabulary

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 a plane?

Back

A plane is a flat, two-dimensional surface.

Front

What are collinear points?

Back

Points that lie on the same straight line.

Front

What is a right angle?

Back

An angle that measures exactly 90 degrees.

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 ray?

Back

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

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 (sides) and four vertices (corners).

Front

What is a circle?

Back

A circle is a shape consisting of all points in a plane that are at a given distance from a center point.

Front

What is a complementary angle?

Back

Two angles are complementary if the sum of their measures is 90 degrees.