which of the following names a radius of circle a?

Answer:
Therefore the third option is the name of radius i.e
[tex]\overline{AC}[/tex]
Step-by-step explanation:
Given:
Circle A i.e A is the center of a Circle.
Radius :
The radius of a circle is the distance from the center of the circle to any point on its circumference.
A is the center of a Circle.
Therefore,
Distance From A to B i.e AB =Radius
Distance From A to C i.e AC =Radius
Distance From A to D i.e AD =Radius
Therefore the third option is the name of radius i.e
[tex]\overline{AC}=Radius[/tex]
Also,
[tex]\overline{BD}=Chord[/tex]
[tex]\overline{BC}=Diameter[/tex]
[tex]\overline{CD}=Chord[/tex]