Question 76
All $ABC$ an isosceles triangle with $AC = BC$, $M$ the middle of the segment $AC$ şi $\ell$ right that goes through $C$ and is perpendicular to $AB$. . The circle passing through the points $B$, $C$ şi $M$ intersect the right $\ell$ in the points $C$ şi $Q$. . Find the radius of the circumscribed circle of the triangle $ABC$ depending on $m = CQ$.