ray
It has two endpoints. A ray has one endpoint.
diameter
A ray = A half-line
a ray
A line segment is a portion of a line. It has length. It has two endpoints. A ray has only one endpoint. It has infinite length in one direction.
I am going to say a line segment. No segments is a line, and one endpoint is a ray.
A figure consisting of two non-collinear rays with a common endpoint is known as an angle. The common endpoint is called the vertex, while the two rays are referred to as the sides of the angle. Angles are measured in degrees or radians, indicating the amount of rotation from one ray to the other. This geometric concept is fundamental in various fields, including mathematics, physics, and engineering.
Only one point. A dimensionless figure.
A cone
parallelogram
on any ray,there is exactly one point at a given distance from the endpoint of the ray
if you are talking about a geometric figure its the octagon
A rectangle.
a cone
None. Degrees are a measurement of angle.
A rectangular pyramid.
One possible answer is: a point.