Please answer and make sure it was on 100% right

Which equations represents circles that have a diameter of 12 units and a center that lies on the y-axis? check all that apply

Measures of the angle of r, 31 s (x+4) t (3x+9)

Does the construction demonstrate how to copy an angle correctly using technology a) yes the distance between points a and f was used to create circle h b) yes the distance between points f and g was used to create circle h c) no the distance between points a and f was used to create circle h d) no the distance between points f and g was used to create circle h