#include <stdio.h>
#include <math.h>

double hypotenuse(double par, double par2)
{

    double sideC;
    sideC = sqrt(pow(par, 2) + pow(par2, 2));

    return sideC;
};

void quadratic(double numA, double numB, double numC, double *awn1ptr, double *awn2ptr)
{

    double awn1 = (-numB) + sqrt(pow(numB, 2) - 4 * numA * numC);
    double awn1F = awn1 / (2 * numA);
    double awn2 = (-numB) - sqrt(pow(numB, 2) - 4 * numA * numC);
    double awn2F = awn2 / (2 * numA);

    *awn1ptr = awn1F;
    *awn2ptr = awn2F;
};

double areaOfCircle(double radius)
{

    double area;
    area = acos(-1) * pow(radius, 2);

    return area;
};

double areaOfTriangle(double height, double base)
{
    return (height * base)*(1.0/2.0);
};

double areaOfRectangle(double height, double base)
{
    return (height * base);
};

double circumferenceOfCircle(double radius)
{
    return (2 * acos(-1) * radius);
};