Question: How can I find radius and center of the circumcircle of triangle CHK?

Let SABCD be a pyramid, with the line SA perpendicular to the plane ABCABCD is a rectangle, AB = aAB = bSA = hH is projection point of A on the line SC and K is projection point of A on the line SD. How can I find radius of the circumcircle of triangle CHK?

restart;
with(Student:-MultivariateCalculus);
A := [0, 0, 0];
B := [a, 0, 0];
C := [a, b, 0];
DD := [0, b, 0];
S := [0, 0, h];
lineSC := Line(S, C);
lineSD := Line(S, DD);
H := Projection(A, lineSC);
K := Projection(A, lineSD);

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