Respuesta :

the answer is diameter (A)
the long line down the middle is diameter and the short line that goes from the middle to the half end of the circle is radius

Answer:

Diameter.

Step-by-step explanation:

Radius is a line going from the middle of the circle to the edge of the circle. Diameter is the line going from one edge of a circle, through the middle, and all the way to the directly opposite side than the beginning of the line.