Geometry Concepts

Front

What is an angle?

Back

An angle is the union of two noncollinear rays with a common endpoint.

Front

What is an acute angle?

Back

An acute angle is an angle with a measure greater than 0 but less than 90.

Front

What is a right angle?

Back

A right angle is an angle with a measure of 90.

Front

What is an obtuse angle?

Back

An obtuse angle is an angle with a measure greater than 90 but less than 180.

Front

What is a polygon?

Back

A polygon is the union of three or more coplanar segments, which intersect at endpoints, with each endpoint shared by only two noncollinear segments.

Front

What are collinear points?

Back

Collinear points are points on the same line.

Front

What are coplanar points?

Back

Coplanar points are points on the same plane.

Front

What is a convex polygon?

Back

A polygon is convex if and only if the lines containing the sides of the polygon do not contain points in its interior.

Front

What is a nonconvex polygon?

Back

A polygon is nonconvex if and only if at least one of its sides is contained in a line, which contains also points in the interior of the polygon.

Front

What is a regular polygon?

Back

A regular polygon is a polygon that is both equilateral and equiangular.