It is called the hub.
It is called the hub.
hubHub
It's called a hub.
It's called a hub.
The center part of the wheel is a spin
the wheel The part that turns people in a circle.
The line from the center of a circle to a point on the circle is the radius.
A central angle.The section of the circle formed by that angle and the part of the circle (the part being the circumference) between the radii is called a sector.
The line from the center of a circle to a point on the circle is the radius.
A great circle is any circle on the surface of a sphere whose center is at the center of the sphere. The shortest distance between two points on the surface of a sphere is a part of the great circle that passes through them.
The center part of a football pitch is called the center circle. It has a radius of 9.15 meters (10 yards) and is located in the middle of the field. The center circle is used during kick-offs and ensures that players remain a certain distance from the ball when the game is restarted.
radius