Hello Bin,

1 plot given points. QA is the radius of a circle because a circle is defined as the locus of points equidistant from a given point. Point P moves along the arc of a circle

2 Draw the slope diagram of QA. calculate the lenght of the hypotenuse which is the radius of the circle

3 Write the circle equation

(y-h)^2 +(x-k)^2 = r^2 where h=3 and k =2 and r= lenght of QA

4 Substitute 5 in this equation for x and solve for y the missing K not related to the k above

bjh