The answer is 2 because if the diameter is the full length of the circle From one side of the circle to the other and you’re trying to find the radius which is from the center of the circle to any point on the circumference of the circle you would difrom one side of the circle to the other and you’re trying to find the radius which is from the center of the circle to any point on the circumference of the circle you would divide the diameter by 2.