Which of the following segments is a radius of oa?

A is the correct answer

Step-by-step explanation:

The radius is half of the diameter.  So it has to start from point 'A'.  The only choice using point A is TA, so choice A is the correct choice

Other radii could be AG, AP, or AR, but none of those choices are listed.

A) TA

Step-by-step explanation:

A radius goes from the center of a circle to the outside edge.  

RP connects two points on the outside edge of the circle without going through the center.  This is not a radius.

TR connects two opposite points on the outside edge of the circle while going through the center.  This is a diameter, not a radius.

GP connects two opposite points on the outside edge of the circle while going through the center.  This is a diameter, not a radius.

TA connects the center of the circle to the outside edge.  This is a radius.

      2

  2 is to go somewhat to the top right of a because it is squared    

v= a h/3