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Answer to Question #27920 in C++ for red rose

Question #27920
The surface area, s, of a cylinder is given by the formula s = 2πrl where r is the cylinder’s radius and l its length. Using this formula, write a C++ function named surfarea() that accepts the radius and length of a cylinder and returns its surface. Make sure your function is called from main() and correctly returns a value to main(). Have main() use a cout statement to display the value returned.
Expert's answer
#define _USE_MATH_DEFINES
#include <cmath>
#include <iostream>

using namespace std;

double surfarea(double r, double l) {
return 2 * M_PI * r * l;
}

int main() {
double r, l;
cout << "Input the radius and length of cylinder." << endl;
cin >> r >> l;
double s = surfarea(r, l);
cout << "The surface area is " << s << "." << endl;
system("pause");
return 0;
}

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