One possibility is a closed shape: a circle, ellipse, a closed wriggly shape.
An angle.
an Angle
An angle is the figure formed by two rays sharing a common endpoint, called the vertex of the angle.
acute
it forms an angle
It is an angle.
An angle.
angle
an angle.
an angle
an Angle
An angle is the figure formed by two rays sharing a common endpoint, called the vertex of the angle.
The meeting points of two rays is called a vertex
angle
An angle is the union of two rays with a common endpoint.
an angle is composed of two rays that have the same endpoint.
An angle