Contest1388/L.cpp

#include <bits/stdc++.h>

using namespace std;

void fout(double x, int scale = 6) {
    cout << setiosflags(ios::fixed) << setprecision(scale) << x << endl;
}

int main(int argc, char const *argv[]) {
    double U, D, H, slope, area, perimeter;
    cin >> U >> D >> H;
    area = (U + D) * H / 2;
    slope = hypot((D - U) / 2, H);
    perimeter = U + D + 2 * slope;
    fout(area, 2);
    fout(perimeter, 2);
    return 0;
}