First commit

IUT/Info1/TD/Exercices/5.6_courbure_terre/56.md

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+distance_homme² = distance_horizon² + rayon_terre²
+distance_horizon² = distance_homme²-rayon_terre²

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;  
+}

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

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+double Distance(double, double);

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

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+#include <iostream>
+#include "distance.h"
+using namespace std;
+
+int main() {
+    double hauteur;
+    double rayonPlanete;
+    double horizon;
+
+    cin >> hauteur >> rayonPlanete;
+
+    horizon = Distance(hauteur, rayonPlanete);
+    cout << horizon;
+}