simp_rw [circumsphere_center, circumsphere_radius, dist_circumcenter_eq_circumradius, max_self]
case h.e'_4
V : Type u_1
Pt : Type u_2
inst✝³ : NormedAddCommGroup V
inst✝² : InnerProductSpace ℝ V
inst✝¹ : MetricSpace Pt
inst✝ : NormedAddTorsor V Pt
hd2 : Fact (finrank ℝ V = 2)
cfg : Imo2019q2Cfg V Pt
⊢ (circumsphere cfg.triangleABC).radius =
    max (dist (cfg.triangleABC.points 1) (circumsphere cfg.triangleABC).center)
      (dist (cfg.triangleABC.points 2) (circumsphere cfg.triangleABC).center)
no goals