First commit

IUT/Info1/TD/Exercices/5.6_courbure_terre/distance.cpp

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+#include "distance.h"
+#include <cmath>
+
+double Distance(double hauteur, double rayonPlanete) {
+    double distanceHorizon;
+    double distanceCentreHomme;
+
+    distanceCentreHomme = rayonPlanete + hauteur;
+    distanceHorizon = pow(distanceCentreHomme, 2) - pow(rayonPlanete, 2);
+
+    return distanceHorizon;  
+}