'h' cannot be used as a function

Question

#include <iostream>
#include <cmath>
using namespace std;

int main()
{
const double pi = 3.14159265359;
double r = 5;
double h = 5;
double answer;

answer = 2 * pi * pow(r , 2) + h (2 * pi * r);

cout << answer << endl;

return 0;
}

I've declared all of my variables and creating my program but when I try to run the program i keep getting " 'h' cannot be used as a function".

Answer 1

2 * pi * pow(r, 2) + h * (2 * pi * r);

Is how it should look. Just add an asterisk after the h.