<h2>
Answer:</h2>
The term that is describes here is: Circle.
<h2>
Step-by-step explanation:</h2>
<u>Circle--</u>
A circle is the collection of all the points in the plane that are equidistant ( at a equal distance) from a fixed point on a plane.
The fixed point is known as the center of the circle.
and the fixed distance is known as the radius of the circle.
Also, the diameter of the circle is the line that passes through the center of the circle and has end points on the circumference of the circle.
Diameter is twice the radius of the circle.
Hence, the answer is: Circle