#include #include using std: : cout; using std: : endl; using std: : cin; using std: : string; // function prototypes int geomenu(); bool validateinput(int, int, int, string); bool validatefloatinput(float, float, float, string); float calculatecircle(); float calculaterectangle(); float calculatetriangle(); // global constants (the only globals that we use) const int circle_choice = 1; const int rectangle_choice = 2; const int triangle_choice = 3; const int quit_choice = 4; // global constant for pi const double pi = 3.14159; int main() { float area = 0.0; // area of the selected shape while (true) {