(1) Calculate the midpoint of the G point according to the perpendicular line where DC is AB, and then calculate the coordinates of the G point according to the value of OB;

(2) First, take point C as the CH⊥x axis, in Rt△ABO, calculate the length of AB according to the number of ABO and the value of OB, then in Rt△CBH, calculate the value of OH to get the coordinates of point D, and then set the analytical formula of straight line CD to get the values of K and B, so as to get the analytical formula of straight line CD;

(3) First, judge the points Q and P, so that the quadrilateral with vertices O, D, P and Q is a diamond. Then discuss it in four situations, draw a picture according to the conditions, and get the coordinates of Q according to the different positions of Q point.

You must be patient when you do this problem. Come on! !

I hope this helps.