Respuesta :

Answer:

a straight line from the centre to the circumference of a circle or sphere.

OR

half of a diameter

Answer:

A radius is a straight line from the center of a circle to the circumference of a circle. If you have two or more of them, they are referred to as radii. All radii in a circle will be the same length. If you put two radii together, edge to edge, going through the center of a circle, you would get a diameter.

Step-by-step explanation: