Respuesta :
The relation is that the diameter is twice the length of the radius.
To make more proof, look at the attached image below.

The radius is half of the diameter.
What is radius of a circle?
A straight line extending from the center of a circle or sphere to the circumference or surface.
Given:
The radius of a circle is the distance from its center to the edge of the circle.
The diameter is the length of a line segment that passes through the center and has endpoints on the edge of the circle.
As, the figure attached below.
It can be seen that the diameter is two times radius drawn and meet at center.
Hence, the radius is half of the diameter.
Learn more about radius here:
https://brainly.com/question/8863374
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